Chapter II: BLEACHING of =Linen=:--Linen may be bleached in a similar way to (22)

=Crucibles, Plat'inum.= These are indispensable instruments in the laboratory of the analytical chemist. They are chiefly employed in the ignition of precipitates, and in the fusion of silicates with carbonated alkalies to render them soluble, a preliminary step to their analysis. The most ordinary form of the platinum crucible is that of a cup with a flat bottom. They are always provided with lids, which are sometimes so constructed that they may be used, when separated from the crucibles, as capsules for ignitions and evaporations. Platinum crucibles are not acted on by carbonated alkalies at a high temperature, but they are liable to be seriously damaged by the caustic alkalies. Precipitates of the more reducible metals must never be ignited in these crucibles, as the reduction of the metals would infallibly destroy the vessels.

=Crucibles, Gold=, are exceedingly useful for many operations, on account of the way which they stand caustic and carbonated alkalies, and nitric acid, which destroy platinum or silver crucibles respectively. Their drawbacks are their great expense and ready fusibility.

=Crucibles, Silver.= These are much used for fusions of alkalies, being much less acted on than platinum crucibles, and also for water analyses, from their cheapness and light weight. They are easily destroyed, however, by acids.

=Crucibles, Plumba'go.= _Syn._ GRAPHITE C., BLACKLEAD C., BLUE POTS. From graphite, ground and sifted, mixed with sufficient refractory clay to render it plastic. They are shaped by hand on an ordinary potter's wheel, or by moulds of metal like that figured above under the head of CRUCIBLES, EARTHEN.

_Prop., &c._ Good blacklead crucibles, even when of the largest size, support the greatest and most sudden alternations of temperature without cracking, and may be used after repeated heating and cooling. Their surface, within as well as without, may be made very smooth, so that particles of melted metal will not hang about the sides. They are now almost universally used for melting the precious metals.

=Crucibles, Por'celain.= These beautiful vessels are now made in Germany and France of all shapes and sizes. They are formed of the most exquisitely white, thin, and hard porcelain, which does not crack when heated, and which is but little acted on by the most energetic chemical reagents. For some operations they supersede platinum crucibles, particularly in the ignition of the precipitates of the more reducible metals. They do not retain colouring matter, and are not porous. Their covers are excellently adapted for delicate cases of testing, the whiteness of the porcelain showing the changes of colour in a single drop of liquid most distinctly.

=Crucibles, Iron.= Used chiefly for preparing common reagents, as sulphide of iron, calcic chloride, &c., and also for preparing pure caustic potassa from the nitrate.

=CRUMP'ET.= A sort of muffin or tea-cake, very light and spongy. _Prep._ From flour, 2 lbs., made into a dough with warm milk-and-water, adding a little salt, 3 eggs (well beaten), and 3 teaspoonfuls of yeast, mixed to the consistence of thick batter; after standing before the fire for a short time, to rise, it is poured into buttered tins, and baked slowly to a fine yellow. For the table, crumpets are toasted lightly on both sides, buttered, piled on a hot dish, and cut into halves.

=CRUST.= The paste with which pies, tarts, &c., are made, or covered.

1. (FINE.) From flour, 1 lb.; sugar, 1/4 lb.; melted butter, 1/2 lb.; 3 eggs; milk, q. s. Requires little baking.

2. (RAISED CRUST, FOR MEAT PIES, &C.) As the last, but using 6 oz. of lard for the butter, and 2 instead of 3 eggs.

3. (SHORT.) From flour, 1 lb.; butter and sugar, of each 2 oz.; eggs, 2 in no.; made into a stiff paste.

_Obs._ The quality is improved if the whole or a portion of the butter is employed in the way directed under PUFF PASTE. For further information hereon, consult the cookery books of Acton, Beeton, Rundell, and Soyer.

=CRY'OLITE= (3NaF_{1}AlF_{3}). A native double fluoride of aluminium and sodium, found in large quantities in Greenland, employed in the manufacture of alum, and also as a source of metallic aluminium.

=CRYOPH'ORUS.= See REFRIGERATION.

=CRYS'TAL.= A solid body, having a regular geometrical form. The plane surfaces by which a crystal is bounded are termed faces; these intersect in straight lines or edges; and these again meet in points, and form angles. The axis of a crystal is an imaginary line passing through its centre, and terminating either in the middle of two faces or of two edges, or in two angles; and axes terminating in similar parts of a crystal are named similar axes. When the axes of a crystal are properly chosen, and placed in a right position, the various faces are observed to group themselves in a regular and beautiful manner around these axes, and to be all so related to them as to compose a connected series, produced according to definite laws. The multitudinous forms of crystals have been distributed by mineralogists and chemists into six primary classes or systems, distinguishable from one another by the relative positions and lengths of the three axes about which the planes or faces are arranged; while the different figures of any particular system are distinguishable by the arrangement of the planes in respect to the axes. Thus, the cube or hexahedron, the rhombic dodecahedron, and the octahedron all belong to the regular system, which is characterised by 3 equal axes cutting one another at right angles. But in the cube each plane cuts 1 axis, and is parallel to 2 axes; in the dodecahedron each plane cuts 2 axes, and is parallel to a third; while in the octahedron each plane cuts the 3 axes. The names and definitions of the six crystalline systems are given below:--

1. REGULAR SYSTEM. { The 3 axes equal
{ and rectangular.
2. SQUARE PRISMATIC S. }
2 equal axes. } The 3 axes unequal,
3. RIGHT PRISMATIC S. } and rectangular.
All unequal. }
4. RHOMBOHEDRAL S. { The 3 axes equal,
{ but not rectangular.
5. OBLIQUE PRISMATIC S. } The 3 axes not
1 axis rectangular to 2. } equal, and not
6. DOUBLY O.P.S. } rectangular.
None rectangular. }

=CRYSTALLISATION.= The act or process by which crystals are formed. The frequent reference to this subject in the pages of this work, and the constant employment of the process of crystallisation in the manufacture of salts, &c., in the laboratory, seem to point out the necessity of a few explanatory remarks thereon under this head. When fluid substances are suffered to pass with adequate slowness to the solid state, or when solutions of solids are slowly concentrated by evaporation, or the solvent powers of the menstruum, gradually lessened by cooling, the ultimate particles of matter frequently so arrange themselves as to form regular geometrical bodies, familiarly known by the name of crystals. This wonderful property, which is possessed by a great variety of substances in the mineral kingdom, and by nearly all saline bodies, is resorted to for many useful and important purposes in the chemical arts. It is by means of crystallisation that the majority of salts are obtained in a state of purity; for in the act of passing into the crystalline state, the foreign substances with which they are united are left behind in the mother-liquor.

Salts are crystallised, either by allowing their hot and saturated solutions to cool slowly, or by simply evaporating the menstrua as long as crystals form. In the first case the liquid is commonly evaporated until a pellicle appears on the surface, when the vessel is set aside in some sheltered situation until cold, at which time the crystals are collected, and the process repeated for fresh crystals. In the second case the crystals are usually removed from the liquid as soon as they are deposited. The first method is adopted for those salts that are considerably more soluble in hot than in cold water, as carbonate of soda, Epsom salts, &c.; the last method, for those that possess nearly equal solubility in both cases, and also for many salts which are not required in handsome crystals; thus common salt and chromate of potash are crystallised in this way. Many of the alkaloids, and their salts, are obtained in crystals, by allowing their solutions (generally alcoholic or ethereal) to evaporate spontaneously. By repeating the processes of solution and crystallisation two or three times with the same body, the crystals obtained by the last operation will usually be found to be quite pure.

Many solids may be readily obtained in a crystalline state by melting them and allowing them to cool very slowly. Thus, iodide of sulphur is crystallised by melting it in a flask placed in a salt-water bath, and allowing it to remain in the water until the whole becomes cold. Sulphur and many metals are crystallised by pouring them, in a state of fusion, into a hot vessel having a plug in the bottom, which is withdrawn as soon as the surface becomes cool, when the liquid portion runs out, and leaves the under surface in the form of a mass of agglomerated crystals. Perfectly pure wax, stearine, and spermaceti have a very pleasing appearance when treated in this way.

=CRYS'TALLOID.= See DIALYSIS.

=CU'BEBIN.= A peculiar substance obtained from cubebs.

_Prep._ From cubebs (from which the oil has been expelled by distillation), by digestion in alcohol, evaporating the resulting tincture to one fourth, filtering, and then evaporating the remaining fluid almost to dryness. The residuum is left in a cold place until it assumes a semi-crystalline appearance, when it is thrown on a filter, and the fluid portion (the 'cubebine' of M. Cassola) allowed to drain off. In 24 hours the substance left on the filter is dissolved in 4 times its weight of boiling alcohol (sp. gr. ·90), the solution allowed to deposit its undissolved resin (still maintaining it near the boiling temperature), after which the clear portion is decanted. The crystals deposited as the liquid cools are cubebin. It is purified by redissolving it in boiling concentrated alcohol, and the addition of a little boiling water and animal charcoal, when long, white needles will be deposited if the solution is allowed to cool very slowly.

_Prop., &c._ It is insoluble in water, and nearly so in cold alcohol, but very soluble in boiling alcohol. It strikes a fine crimson colour with sulphuric acid, which remains unaltered for some hours; a property which distinguishes it from piperin. Its physiological action has been but little studied. According to Dr Görres, this for the most part resembles that of cubebs.

=CU'BEBS.= _Syn._ CUBEB PEPPER; CUBEBA (B. P. & U. S.), CUBEBÆ (B. P.), L. The immature and stalked fruit of _Piper cubeba_ or _Cubeba officinalis_. Cubebs are stimulant, stomachic, and aromatic, like the other peppers; they are also diuretic, and appear to possess a specific influence over the urino-genital organs.--_Dose_, 10 to 20 gr., in affections of the bladder and prostate gland, and in gleet and leucorrh[oe]a; 1 to 3 dr., in the early and inflammatory stages of gonorrh[oe]a, in piles, &c. They may be taken in water, milk, or bitter ale.

=CU'CUMBER.= The fruit of the _Cucumis sativus_ (Linn.). Used as a salad vegetable. It is somewhat indigestible, but when properly dressed, with plenty of oil, it may be eaten without the slightest fear of evil consequences. The practice of pouring off the natural juice extracted from the cucumber by salt cannot be too strongly condemned. See ELATERIUM.

=CUD'BEAR.= _Syn._ PERSIO. A dye-stuff obtained from _Lecanora tartarea_ and other lichens, by a process nearly similar to that used in making ARCHIL. The lichen is watered with stale urine or other ammoniacal liquor, and suffered to ferment for 3 or 4 weeks, after which the whole is poured into a flat vessel, and exposed to the air until the urinous smell has disappeared, and it has assumed a violet colour. It is then ground to powder. Its use is confined to a few cases of silk dyeing, where it is employed to yield shades of ruby and maroon; upon wool it gives deep-red shades. The colours produced by it are very fugitive. Like archil, there are two varieties of this dye-stuff--BLUE CUDBEAR and RED CUDBEAR. See ARCHIL.

=CULM.= In _mineralogy_, a slaty kind of ANTHRACITE, occurring in Wales and North Devon. The term is also applied to any impure, shaly kind of coal.

=CU'MARIN.= See COUMARIN.

=CU'MIN.= _Syn._ CYMINI SEMINA, CYMINUM, L. The fruit (seed) of _Cuminum cyminum_. It is carminative and aromatic, like the caraway and anise. See PLASTER.

=CU'MINOL.= A colourless, transparent oil, of powerful odour. It exists with CYMOL in OIL of CUMIN. See CYMOL.

=CU'PELLATION.= The process of assaying gold and silver and their alloys by means of the CUPEL. See ASSAYING.

=CUP'PING.= This method of topical bleeding is performed as follows:--

The skin being softened by means of a sponge and warm water, and the hair and other extraneous substances being previously removed, one of the small bell-like glasses (CUPPING-GLASSES; CUCURBITU'LÆ), having the air contained in it rarefied by being passed over the flame of a spirit-lamp, is immediately applied to the part. From the formation of a partial vacuum beneath the cup, the pressure of the air on the surrounding surface causes that portion immediately under the cup to swell, and the vessels to become turgid. When this has taken place the cup is removed, and several incisions are instantly made by means of a scarificator, an instrument containing numerous lancets, which, by means of a spring, make a number of incisions at the same moment; the depth of these incisions being regulated by means of a screw which protrudes or withdraws the lancets, according to the vascularity of the part, or the quantity of blood to be abstracted. The cupping glass is now again applied. When a sufficient quantity of blood has been collected in the cup, it is removed by gently introducing the nail of one of the fingers under the upper edge, by which means, air being allowed to enter, the cup becomes detached. The part being washed with warm water to remove any clots of blood, another cup is applied as before, and the operation continued until a sufficient quantity of blood is withdrawn. Sometimes, especially when applied to the scalp, the cups fill so rapidly with blood as to become detached almost immediately on being applied. This method of local bleeding is frequently called 'CUPPING WITH SCARIFICATIONS,'

When cupping-glasses are applied without the use of the lancet or scarificator, the operation is called 'DRY CUPPING,' and is much used to cause a speedy irritation of the skin and reaction, for the relief of oppressive breathing, local pains, &c. To obtain the full benefit from this operation, the cups should be suffered to remain upon the part until they cause an exudation of a small quantity of serum, or a considerable amount of irritation of the part. Dry cupping has been found extremely beneficial in poisoned wounds; as it acts not only by abstracting the poison, but also, by the pressure the glasses exercise on and around the part, in preventing the absorption of it.

_Obs._ For the operation of cupping, a basin of hot water, sponges, and clean, soft towels, should be provided. In clumsy hands, cupping is occasionally a severe and painful operation; but this is not the case with the skilful operator. A good cupper does not exhaust much of the air in the cup before applying it, but simply passes its mouth rapidly over the flame of the lamp. When it is held over the flame even for a few seconds, the compression of the edge of the cup upon the skin is so great, that it checks the flow of the blood to the scarified part. A good cupper also removes the cup without spilling the contents, and completes the whole operation quickly and neatly. There are, however, few persons, who are not professional cuppers, who are sufficiently expert to exhaust the air in the cup by means of the common lamp; although it is by far the best. A good plan is to rarify the air in the cup by means of a small cone of paper, dipped in spirits of wine, or strong brandy; this is ignited and thrown in the cup, which is instantly to be applied to the proper spot. Where cupping-glasses and the scarificator are not to be had, wine-glasses, or any very small tumblers, may be substituted for the first; and small incisions by means of a thumb lancet will answer the purpose of the other.

The cicatrices of the scarification leave permanent marks on the skin; on which account, when blood is to be drawn from the head or neck, the glasses should be applied behind the ears, and a portion of hair removed in such a manner that the part may be covered by what remains.

A most convenient cupping apparatus is manufactured by Mr Bigg, the eminent surgical instrument maker of Leicester Square, consisting of cups and an exhausting syringe, so arranged that the use of the spirit-lamp is rendered unnecessary, and the operation of cupping may be performed nearly as expertly by an inexperienced nurse as by the most accomplished professional operator. It is invaluable in places remote from town.

=CURAR'INE.= _Syn._ CURARIA. The vegeto-alkaline base of curara, urari, woorara, woorali, or wourali, the arrow-poison of Central America.

In physiological effects curarine is antagonistic to strychnia, a fact which has led to its being proposed as an antidote for the latter poison. Curarine is also said to have been employed in Germany in the treatment of hydrophobia with such success that the patient to whom it was administered recovered. It is a most potent poison, and should not be allowed to come into contact with the fingers.

=CURB.= In _horses_. An enlargement at the back of a horse's hock caused by injuring a ligament in this region. See SPRAIN.

=CURCU'MIN.= The yellow colouring matter of turmeric, obtained by digesting the alcoholic extract of the powder in ether, and evaporating the clear ethereal solution to dryness. A brownish-yellow mass, yielding a bright-yellow powder. It is scarcely soluble in water, but very soluble in both alcohol and ether. Boracic and hydrochloric acids redden it; alkalies turn it reddish brown.

=CURD.= Coagulated casein. See CHEESE.

=CUR'RANTS.= The currants of our garden are varieties of the _Ribes rubrum_ and _Ribes nigrum_. (Linn.) The first includes RED CURRANTS and WHITE CURRANTS; the fruit of both of which are gently acidulous, cooling, and wholesome. The juice makes excellent wine. The fruit of the last (BLACK CURRANTS, QUINSY-BERRIES) is aperitive, and has been used in calculous affections; the juice is made into wine, jellies, jams, lozenges, &c. The young leaves are used as a substitute for tea; one or two buds, or half a small leaf, impart to black tea the flavour and fragrance of green. The currants of the grocers (ZANTE CURRANTS) are a small variety of dried grapes. The word "currant" is a corruption of Corinth, whence the fruit originally came.

=CUR'RY.= _Syn._ CURRIE. A noted dish in Indian cookery, much esteemed throughout the East. Curries are simply stews, of which rice usually forms a characteristic ingredient, highly flavoured with fried onions and curry powder, to which sliced apples and lemon juice are sometimes added. They are made from every variety of fish, meat, poultry, game, &c., according to the fancy of the parties.

_To make a Dish of Curry._--Cut an onion into slices and fry it with an apple, finely chopped, in two ounces of dripping; then add slices of cold meat; mix a dessert-spoonful of curry powder and one of flour in half a pint of water; pour it over the meat, and shake the whole over the fire till it boils.

=Cur'ry Powder.= _Prep._ (Kitchener.) From coriander-seed, 1/4 lb.; turmeric, 1/4 lb.; cinnamon-seed, 2 oz.; cayenne, 1/2 oz.; mustard, 1 oz.; ground ginger, 1 oz.; allspice, 1/2 oz.; fenugreek-seed, 2 oz.; all dried thoroughly, pounded in a mortar, rubbed through a sieve, and mixed together.

The famous Ceylon curry powder is said by Dr Balfour to have the following rather indefinite composition:--A piece of green ginger, two fragments of garlic, a few coriander and cumin seeds, six small onions, one dry Chili, eight peppercorns, a small piece of turmeric, half a dessert-spoonful of butter, half a cocoa-nut, and half a lime. For it to be in perfection the powder should be made the day on which it is cooked.

_Obs._ The above must be regarded as merely a substitute for Indian curry powder, which contains many ingredients not to be obtained in England. It should be kept in a bottle closely corked or stoppered. The curry powder sold at the present time consists of coriander-seed, turmeric, cayenne, fenugreek-seed, and a large proportion of sago-flour.

=CUS'CONINE.= See ARICINE.

=CUSPA''RIA.= _Syn._ CUSPARIA BARK (B. P.), ANGOSTU''RA B.; COR'TEX ANGOSTU''RÆ, C. CUSPA''RIÆ, CUSPARIA (Ph. L. and E.), L. "The bark of _Galipea cusparia_" (Ph. L.), or _Galipea officinalis_ (Ph. E.). A valuable drug, imported directly or indirectly from South America.--_Dose_, 10 gr. to 30 gr., as a tonic, stomachic, and febrifuge, in similar cases to those in which CASCARILLA, CALUMBA, and CINCHONA, are commonly given.

--------------------------------------------------------------------------
Characters. | False Angostura. | True
| | Angostura.
--------------------------------------------------------------------------
{ Flat or rolled
_Form_ { Thick, rugous, rolled upon { up, little
{ itself. Edges cut perpendicularly. { wrinkled,
{ edges bevelled.

{ Brown, or greenish-yellow, {
{ presenting protuberances {
{ or excrescences, {
{ produced by {
_Colour_ { the great development { Greyish-yellow.
{ of the corky layer, which {
{ has a still more yellow {
{ colour. {

_Taste_ | Very bitter. | Bitter.

_Reaction } Red colour when dropped } Yellow
with Nitric } upon the bark. } colour.
Acid._ }

Angostura or cusparia bark has fallen into comparative disuse, in consequence of nux vomica or false angostura bark having formerly, in several instances, been mistaken for it, and administered with fatal results. The leading characteristics of these two barks have been pointed out by M. Gibourt. (See previous table.)

=CUSPAR'IN.= _Syn._ ANGOSTU''RIN, ANGOSTU''RA. The bitter principle of Cusparia-bark. It is neutral; crystallises in tetrahedrons; is easily fusible; soluble in rectified spirits, in acids, and in alkaline solutions. It is precipitated of a whitish colour by tincture of galls.

=CUS'TARD.= A composition of milk, or cream, and eggs, sweetened with sugar, and variously flavoured. Custards may be cooked either in the oven or stew-pan.

_Prep._ 1. (Soyer.) Milk (boiling), 1 pint; sugar, 2 oz.; thin yellow peel of half a lemon; mix, and set it aside for a short time; then take eggs, 4 in no., beat them well in a basin; add, gradually, the milk (not too hot), pass the mixture through a colander or sieve, and fill the custard cups with it; these are then to be placed over the fire in a stew-pan, containing about one inch of hot water, and left there for 12 minutes, or till sufficiently set. The above is for PLAIN CUSTARDS; but it forms a good basis to receive any of the usual flavouring ingredients, as fresh or stewed fruit, peels, essences, orange-flower water, brandy, or other spirits, &c.

2. (Rundell.) As the last, but using cream instead of milk, or equal parts of the two, with 2 additional eggs. Very rich; like the last, any suitable flavouring matter may be added to it.

3. (ALMOND CUSTARDS,--Rundell.) As either of the above, adding blanched sweet almonds, 4 oz.; bitter do., 6 in no.; beaten to a smooth paste.

4. (BAKED CUSTARDS,--Rundell.) From cream, 1 pint, with 4 eggs; flavoured with mace, nutmeg, and cinnamon, and add a little white wine, rose-water, and sugar; bake in cups.

5. (COFFEE CUSTARDS,--Soyer.) Hot milk and strong-made coffee, of each 1/2 pint; sugar, 2 oz.; dissolve, and add it, gradually, to 4 eggs (well beaten), and proceed as in No. 1. Chocolate custards and cocoa custards are made in the same way.

6. (COLD CUSTARD, _for invalids_,--Dewees.) 1 egg; sugar, a tablespoonful; beat well together; and add, gradually, constantly stirring, cold water, 1/2 pint; rose water, 2 teaspoonfuls; and a little grated nutmeg. An agreeable and nutritious demulcent. A wine-glassful every 2 or 3 hours, or _ad libitum_.

7. (LEMON CUSTARDS,--Rundell.)--_a._ As No. 1 (nearly), using a little more lemon peel. In the same way orange custards are made, but using orange peel.

_b._ From candied lemon peel and lump sugar, of each 2 oz., beaten in a mortar quite fine, and added to either No. 1 or No. 2. Orange and citron custards may be made in the same manner. A little orange-flower water, or marsala, or sherry, may be also added at pleasure. They are best baked.

8. (ORANGE CUSTARDS.) As _above_, No. 7, _a_ and _b_.

9. (RICE CUSTARDS,--Rundell.) Boil 1/2 a cupful of the best ground rice in a pint of milk until dissolved, then mix it with a quart of cream; flavour with nutmeg, mace, and a little brandy, and put it into a cup or a dish.

=CUTCH.= See CATECHU.

=CUTTLE-FISH.= The bone or skeleton of the _Sepia officinalis_ of Linnæus, or common cuttle-fish (CUTTLE-FISH BONE; OS SE'PIÆ), is used by the law-stationers to erase ink-marks from paper and parchment, an application familiar to most schoolboys of the present generation. Reduced to powder (PUL'VIS SE'PIÆ), it forms a valuable dentifrice and polishing powder, and is used for forming the moulds for small silver castings.

The _Sepias_, which inhabit the seas of all quarters of the globe, like the other _cephalapoda_, are carnivorous. They are able to exercise considerable locomotive powers, by means of their tentaculæ or arms which surround the mouth, and which are usually provided with numerous suckers. Head downward, they walk on these arms at the bottom of the ocean. The _sepias_ are also fleet swimmers; effecting their progress through the water either by making the expansion of their skin perform the same office as fins; or by the forcible projection of water from the cavity of their mouths, the reaction accompanying which operation drives them rapidly through the water in a different direction. They are provided sometimes with eight, and sometimes with ten tentaculæ, and have naked bodies. The black fluid which the animal is capable of ejecting from its ink-sac, when pursued by its enemies, was formerly employed in the manufacture of the pigment called from its source "sepia."

=CUTS.= These are incised wounds of greater or less extent, and must be treated accordingly. The divided parts should be drawn close together, and held so with small pieces of strapping or adhesive plaster stretched across the wound. If the part is covered with blood, it should be first wiped with a damp sponge. When the wound is large and it is much exposed, a good method is to sew the parts up. The application of a little creasote or a spirituous solution of creasote will generally stop local bleeding, provided it is applied to the clean extremities of the wounded vessels. A good way is to place a piece of lint, moistened with creasote, on the wound, previously wiped clean, or to pour a drop or two of that liquid on it. An excellent method is to cover the part with a film of collodion. Friar's balsam, quick-drying copal varnish, tincture of galls, copperas water, black ink, &c., are popular remedies applied in the same way. A bit of the fur plucked from a black beaver hat is an excellent remedy to stop the bleeding from a cut produced by the razor in shaving. A cobweb is said to possess the same property.

=CY'ANATE.= _Syn._ CY'ANAS, L. A salt in which the hydrogen of cyanic acid is replaced by a metal or other basic radical.

=CYAN'IC ACID.= HCNO. _Syn._ ACIDUM CYAN'ICUM, L. _Prep._ 1. Cyanuric acid, deprived of its water of crystallisation, is distilled in a retort, and the product collected in a well-cooled receiver.

2. (Liebig.) A current of sulphuretted hydrogen gas is passed through water in which cyanate of silver is diffused, the process being suspended before all the cyanate of silver is decomposed.

_Prop., &c._ Cyanic acid is a limpid, colourless liquid; it reddens litmus; is sour to the taste; possesses a modified sulphurous odour, similar to that which is always perceived when any of its salts are decomposed by an acid; it forms salt with the bases called CYANATES; when in contact with water it suffers decomposition in a few hours, and is converted into bicarbonate of ammonia; it cannot be preserved for any time, as shortly after its preparation it spontaneously passes into a white, opaque, solid mass, to which the name CYAMELIDE has been given. By distillation this new substance is reconverted into cyanic acid.

=CY'ANIDE.= _Syn._ CYAN'URET; CYAN'IDUM, CYANURE'TUM, L. The compound formed by the union of cyanogen with a metal or other radical. See CYANOGEN, HYDROCYANIC ACID, and the respective bases.

=Cyanide, Al'kaline.= _Syn._ CRUDE CYANIDE OF POTASSIUM AND SODIUM. _Prep._ (R. Wagner.) Dry ferrocyanide of potassium, 4 parts, dry carbonate of soda, 1 part, are melted together in an iron crucible at a red heat, and continually stirred until the iron rod comes out covered with a white crust, when the heat is withdrawn, and after a few moments' repose the supernatant liquid portion is poured out on a clean iron slab. This crude mixed cyanide is quite as useful as the more expensive one of Liebig, and is equally fit for technical applications, as electrotyping, gilding, silvering, &c. See POTASSIUM, CYANIDE OF.

=CY'ANINE.= A base discovered by Mr G. Williams in CHINOLINE BLUE. See _below_.

=Cyanine, I'odide of.= _Syn._ CHIN'OLINE BLUE. The action of iodide of amyl upon chinoline gives rise to iodide of amylchinoline. Addition of excess of soda to an aqueous solution of this iodide produces a black resinous precipitate, which dissolves in alcohol with a magnificent blue colour. This precipitate is the IODIDE OF CYANINE, or CHINOLINE BLUE. Many attempts have been made to use it in dyeing; they have, however, failed on account of the instability of the colour.

=CYAN'OGEN.= CN or Cy. A highly important compound radical or quasi element, discovered by M. Gay Lussac in 1815.

Best obtained by carefully igniting dry cyanide of mercury in a small retort, and collecting the gas over mercury.

_Prop., &c._ A colourless gas, possessing a pungent and peculiar odour, resembling that of peach-kernels or prussic acid; under a pressure of about 4 atmospheres, at a temperature of 45°, it assumes the liquid form (Faraday), and this fluid again becomes gaseous on withdrawal of the pressure; water absorbs nearly 5 times its bulk of cyanogen at 60° Fahr., and alcohol about 23 times its volume; with hydrogen it forms hydrocyanic acid, and with the metals a most interesting and important class of bodies called cyanides or cyanurets; when kindled, it burns with a beautiful purple flame, carbonic acid and nitrogen being evolved. Sp gr. 1·806. See HYDROCYANIC ACID, &c.

Forms a bromide and iodide when the cyanide of mercury is distilled with bromine or iodine, and which are colourless, volatile, highly poisonous solids; and two isomeric chlorides, one a very volatile liquid, prepared by passing chlorine over moist cyanide of mercury, and the other in white volatile needles, prepared by exposing aqueous hydrocyanic acid to chlorine in sunshine.

=CYANU''RIC ACID.= H_{3}C_{3}N_{3}O_{3}. _Syn._ PYRO-U''RIC ACID[dagger]. A peculiar acid, discovered by Scheele. It is a product of the decomposition of the soluble cyanates by dilute acids, or of urea by heat, &c.

=CY'DER.= See CIDER.

=CY'DONINE.= The peculiar gum of quince seed. It resembles bassorin in most of its properties.

=CY'MIDINE.= An oily base, homologous with aniline, obtained by the action of iron filings and acetic acid on nitro-cymol.

=CY'MOL.= A peculiar hydrocarbon found in oil of cumin, in admixture with cuminol. The two bodies are separable in a great measure by distillation, cymol being the most volatile portion of the oil.

=CYNAPINE.= An alkaloid obtained from _Æthusa cynapium_, or _fool's parsley_. It possesses no practical interest.

=CYSTICERCI.= These parasites are embryo tænia or tapeworm, infesting the bodies of men and different animals. One variety of the _cysticerci_ has its habitat in the organisms of men, pigs, oxen, horses, camels, sheep, and roe-deer; another in the muscles and internal organs of cattle; a third is found in cattle, sheep, horses, the reindeer, squirrels, certain kinds of monkeys, and occasionally in man; whilst a fourth--the _Cystercus cellulosæ_--is more especially met with in measly pork. Professor Gamgee believes that probably 5 per cent. of the pigs in Ireland are affected with this last _cystercus_.

The following figure represents a piece of measly pork infested with cysticerci. Professor Leuckart seems to have shown pretty conclusively that man may become infested with a certain form of tapeworm by partaking of imperfectly cooked veal or beef, infested with the second variety of the parasite.

=CYST'INE.= C_{3}NH_{7}SO_{2}. _Syn._ CYST'IC OXIDE. Obtained from cystic oxide calculi (in powder) by digestion in solution of ammonia. By spontaneous evaporation the ammoniacal solution deposits small, colourless crystals of cystic oxide. It forms a saline compound with hydrochloric acid, and is decomposed by the strong alkalies.

=CY'TISINE.= A purgative bitter principle, extracted from the _Cytisus Laburnum_ (Linn.), or _common laburnum_, and some other plants.

=DAGUERRE'OTYPE.= See PHOTOGRAPHY.

=DA''HLIA DYE= (d[=a]le'-y'[)a]). The shade of colour which is commonly termed 'dahlia' is a reddish lilac. It is produced by combining a blue or purple with red when a compound colour is used. Upon wool and silk it can be obtained directly by means of archil or cudbear, either alone or 'blued' by a small quantity of sulphate of indigo. Upon cotton indifferent shades of dahlia are obtained by macerating in sumac liquor, working in tin solution, and dyeing in logwood mixed with some red wood.

=DA''HLINE.= A species of fecula obtained from the tubers of the dahlia. It is identical with inuline. It is not employed in the arts.

=DAIR'Y.= The place where milk is kept, and cheese and butter made. The best situation for a dairy is on the north side of the dwelling-house, in order that it may be sheltered from the sun during the heat of the day. Ample means should be provided to ensure ventilation, and at the same time to exclude flies and other insects. The temperature should be preserved, as much as possible, in an equable state, ranging from 45° to 55° Fahr. To lessen the influence of external variations of temperature, the walls should be double, or of considerable thickness, and the windows provided with shutters or doors. In summer the beat may be lessened by sprinkling water on the floor, which will produce considerable cold by its evaporation. Dairies built of mud or 'cob' are preferred in the West of England; and this preference arises from the uniform temperature they maintain, on account of the great thickness of the walls, and their being very bad conductors of heat. In large dairy-farms, where butter and cheese are made, the dairy is generally a separate building, and divided into 3 or 4 apartments; one of which is called the 'milk-room,' a second the 'churning-room,' a third the 'cheese-room,' containing the cheese-press, &c.; and a fourth the 'drying-room,' where the cheeses are placed to dry and harden. To these may be added a scullery, furnished with boiler, water, &c., for scalding and cleaning the dairy utensils.

Cleanliness is very essential in all the operations of the dairy, and in none more so than in the milking of the cows. The hands and arms of the milkmaid should be kept scrupulously clean, and should be well washed with soap and water after touching the udder of a sick cow, as without this precaution the sores may be conveyed to the healthy ones. The milk-cans should be scalded out daily, and, as well as all the other dairy utensils, should be kept clean and dry. Before placing the milk on the shelves of the dairy it should be strained through a hair sieve or a searce covered with clean cheese-cloth, as by this precaution any stray hairs that may have fallen into the milk-pail will be taken out.

The average produce of a milch cow, supplied with good pasturage, is about 3 gallons daily from Lady-day to Michaelmas, and from that time to February about 1 gallon daily. Cows of good breed will be profitable milkers, to 14 or 15 years of age, if well fed. See BUTTER, CHEESE, CREAM, &c.

=D'ALBESPYRE'S BLISTERING TISSUE.= Lard and ship's pitch, of each 1 part; resina flav. and yellow wax, of each, 4 parts; finely powdered cantharides, 6 parts; melted together, and spread over taffety.

=DAMAS'CUS BLADES.= See STEEL.

=DAMENPULVER--Ladies' Powder= (J. Pohlmann, Vienna). A face powder composed of 14 parts white lead, 7 of talc, 1 of magnesia, coloured with carmine and perfumed with volatile oil.

=DAMMAR.= A resin employed in mounting many microscopic objects; such as teeth, hair, hard bone, and most tissues which have been previously hardened by treatment with alcohol and chromic acid. Dammar is prepared for use as follows:--

_a._ Gum dammar, 1/2 oz.; oil turpentine, 1 oz.; dissolve and filter.

_b._ Gum mastic, 1/2 oz.; chloroform, 2 oz.; dissolve and filter. Add solution _a_ to solution _b_. (Dr Klein.)

If allowed to become thick by drying, dammar may be used as luting.

=DAMP=, under any form, should be avoided. A humid atmosphere or situation is one of the commonest causes of agues, asthmas, rheumatism, and numerous other diseases.

=Damp Linen= is very injurious, and should be especially avoided. In travelling, when it is expected that the bed has not been properly aired, a good plan is to sleep between the blankets. To ascertain this point the bed may be warmed, and a cold, dry, glass tumbler immediately afterwards introduced between the sheets, in an inverted position. After it has remained a few seconds, it should be examined, when, if it is found dry, and undimmed by steam, it may be fairly presumed that the bed is well aired; but if the reverse should be the case, it should be avoided. When it is impossible to prevent the use of damp linen, as articles of dress, the best way to obviate any ill effects is to keep constantly in motion and avoid remaining near the fire, or in a warm apartment, or in a draught of cold air until sufficient time has elapsed to allow of the escape of the moisture. The effect of evaporation is the reduction of the temperature of the body; hence the depressing action of damp linen.

=Damp Walls.= Ivy planted against the sound wall of a house is said to exclude dampness. If a wall is already damp, ivy planted against it will, when grown up, cause it to become dry, provided the brickwork is sound and the dampness does not arise from moisture attracted upwards from the foundation. Sometimes, when ivy is propagated from flowering branches, it will not adhere to a wall at all; the way to get over this difficulty is to cut it back to near the surface of the ground. The young wood which will then form will take hold and cling immediately to almost anything.

The following is said to be a good application for damp walls:--Dissolve 3/4 lb. of mottled soap in 1 gallon of water. This composition is to be laid over the brickwork steadily and carefully with a large thick brush, but not in such a manner as to form a froth or lather on the surface. It must be allowed 24 hours to dry on the walls. Now mix 1/2 lb. alum with 4 gallons of water; let it stand 24 hours, and then apply it over the coating of soap. The operation must be performed in dry weather.

=DAM'SON.= A species of small black plum, much used in the preparation of tarts, &c. Damsons are rather apt to disagree with delicate stomachs, and also to affect the bowels. See PLUM.

=DAN'CING.= The practice of dancing as an amusement or exercise must be almost as old as the human race itself. Yet, notwithstanding its antiquity and prevalence amongst all nations, both barbarous and refined, the propriety and advantages of its cultivation are of a very questionable character. In a hygienic point of view it can claim no preference, as an exercise, over the more simple ones of walking and running; whilst, from the associations it frequently induces, and the heated and confined atmosphere in which its votaries commonly assemble to indulge in it, it becomes the fertile parent of immorality and consumption. A celebrated cyclopædist has, perhaps harshly, but truthfully, defined dancing to be "a silly amusement for the idle and thoughtless."

=DANDELI'ON.= _Syn._ PISS-A-BED; TARAX'ACUM (Ph. L. E. & D.), L. A common British plant of the natural order Compositæ. It is known among botanists by the names _Taraxacum officinale_, _T. dens leonis_, and _Leontodon Taraxacum_ (Linn.). Its root (_Taraxaci Radix_, B. P.) is employed in medicine, being diuretic and tonic. It is roasted and used as coffee, and when mixed with an equal weight of foreign coffee constitutes the article once so much puffed under the name of 'dandelion coffee.' A similar mixture prepared with chocolate forms the 'dandelion chocolate' of the shops. The blanched leaves are used in salads, and the inspissated juice, extract, and decoction are employed in medicine, and are considered as detergent, aperitive, and deobstruent. Ground roasted dandelion root cannot now be sold under the name of 'dandelion coffee' or mixed with coffee unless it has previously paid the chicory duty. See DECOCTION, EXTRACT, &c.

=DANDRIFF.= This is a scaly disease affecting the head, and giving rise to the formation of the small troublesome particles known as scurf. A serviceable application is two drachms of borax dissolved in a pint of camphor water; the head to be washed with this lotion once or twice a week, or much benefit may also be derived by washing the head with tepid water, agitated with a piece of quillar bark until a strong lather is produced; or with water containing salt of tartar, in the proportion of two drachms of the salt to a pint of tepid water. As a general rule, the use of soap is to be discountenanced.

=DAN'IELL'S BATTERY.= See VOLTAIC ELECTRICITY.

=DAPH'NIN.= A peculiar bitter principle, discovered by Vauquelin in the _Daphne mezereum_ or _mezereon_. It is procured by separating the resin from the alcoholic tincture of the bark by evaporation; afterwards, diluting the residue with water, filtering, and adding acetate of lead. A yellow substance falls down, which, when decomposed by sulphuretted hydrogen, yields daphnin, under the form of small, colourless, transparent, radiated needles. It is bitter; volatile; sparingly soluble in cold water; freely soluble in hot water, and in alcohol and ether. It possesses basic properties. See MEZEREON.

=DARNEL.= The powder of the seed of the _Lolium temulentum_, a poisonous grass, is not unfrequently found mixed with the flour of wheat, oats, and other cereals, and when these latter, under these circumstances, are partaken of as food, they give rise to more or less alarming symptoms of poisoning, which are thus enumerated by Dr Pareira:--Headache, giddiness, languor, ringing in the ears, confusion of sight, dilated pupil, delirium, heaviness, somnolency, trembling convulsions, paralysis, and great gastro-intestinal irritation. One of the most specific signs of poisoning by darnel seeds is said by Seeger to be the trembling of the whole body. Dr Taylor mentions a case in which thirty persons who had partaken of bread containing darnel seeds were violently attacked with the above symptoms; and another case is on record of sixty persons in a prison at Cologne being similarly attacked from the same cause. Hassall states that the flour of the darnel seed presents the following appearance under the microscope:--"The starch corpuscles are polygonal, and resemble in this respect those of rice. They are, however, much smaller, and frequently united into compound grains of various sizes, the larger grains consisting of some fifty or sixty starch corpuscles." The structure of the testa is very different from that of either rice or oat, or indeed any of the other cereal grains. It is formed of three coats or membranes. The cells of the outer coat form but a single layer, and, contrary to the arrangement which exists in the oat, their long axes are disposed transversely, in which respect they resemble rice. The fibres of the husk of rice and the cells of the testa of Lolium are, however, very distinct in other respects. In the former the cells are long and narrow, forming fibres, while in the latter they are but two or three times as broad.

The cells of the second coat, which are ranged in two layers, follow a vertical disposition, an arrangement which is contrary to that which obtains in all the other cereal grains with the exception of rice. The cells of the third coat form but a single layer, and resemble those of other grains.

=DATU'RA.= _Syn._ THORN-APPLE; STRAMO'NIUM (Ph. L. E. & D.), L. A genus of plants belonging to the nightshade order, or '_Atropaceæ_,' The species _Datura Stramonium_ is an important medicinal plant, the leaves and seeds being officinal in B. P. It is anodyne and sedative, but not hypnotic, though it will often induce sleep by relieving pain. It affects the constitution in much the same way as belladonna.--_Dose_, 1 to 4 or 5 gr., in asthma, gout, headache, neuralgic and rheumatic pains, &c. In spasmodic asthma smoking the leaf often gives instantaneous relief, but must be exhibited with care, as the whole plant is intensely poisonous. No antidote is known. Another species, namely, _Datura tatula_, is now preferred for cigars or cigarettes. Cigars are made from _Datura Stramonium_ more frequently than from _Datura tatula_. They are recommended for asthma. See ASTHMA, CIGARS (Stramonium), DATURIA (_below_).

=DATU'RIA.= _Syn._ DATU'RINE, DATURIN'A, HYOSCY'AMINE. An organic alkali, discovered by Geiger and Hesse in _Datura Stramonium_ or thorn apple. It occurs also in _Hyoscyamus niger_ or henbane. It is best obtained from the seeds. Daturia dissolves in 280 parts of cold and 72 parts of boiling water; it is very soluble in alcohol, less so in ether. It tastes bitter, dilates the pupil strongly, and is very poisonous. It may be sublimed unaltered, and may be obtained in prismatic crystals by the addition of water to its alcoholic solution. With the acids it forms salts, which are mostly crystallisable.

=DAVIDS-THEE--David's Tea= (B. Fragner, Prague). Recommended as a domestic remedy for chronic catarrh of the lungs and air passages, and especially for tuberculosis. A mixture of equal parts of great centaury, hyssop, chervil (Scandix odorata), white horehound, milfoil, Iceland moss, and carduus benedictus.

=Davids-Thee, Echter Karolinenthaler--Genuine Karolin's Dale David's Tea= (Kràl). Recommended for the same diseases as the preceding. A mixture of white horehound, milfoil, Iceland moss, great centaury, and ground ivy. According to a communication from a Bohemian apothecary the original prescription reads thus:--Herba cerefolii (Scandicis, chervil), hb. centaurii minoris (lesser centaury), hb. marrub. (horehound), flor. millefol. (milfoil flowers), lichen. Isl., of each 6 parts; hb. hyssopi, 3 parts; hb. cardui benedicti, 2 parts. (A. Selle.)

=DEAD, DISPOSAL OF.= As every dead body during the process of the decomposition it undergoes gives rise to products that are not only in the highest degree offensive, but in an especial sense dangerous to the health and lives of a community, the disposal of the dead in a manner best calculated to ensure, with the removal of the corpse from amongst the survivors, the least injurious consequences of its subsequent decay, becomes a problem of supreme importance to the sanitarian.

Probably amongst the nations of antiquity the Romans, with their eminently practical minds, and as we may infer from their other enlightened sanitary arrangements, were the only ancient people who were not guided either by superstitious or religious ideas in the disposal of their dead, at one time burned, but afterwards buried them. The Greeks practised cremation, the Egyptians embalmment (previously disembowelling the body), under the belief that after the lapse of many thousands of years the soul would return to its earthly mansion. The Hebrews sometimes burned their dead, and sometimes interred them. Amongst the ancient Hindoos the body was got rid of sometimes by cremation, sometimes by being cast into the Ganges, or other sacred river, and sometimes by exposure, until eaten by vultures. The Icthyophagi, or fish-eaters, appear to be the only people of antiquity who disposed of their dead by throwing them into the sea.

Amongst modern civilised nations interment is the method almost universally adopted for disposing of the dead.

Embalmment has been of late years occasionally practised in America, and was frequently adopted during the late civil war in many cases, since it afforded the means of sending the bodies of the slain to surviving relatives at long distances. Sir Henry Thompson's advocacy of cremation was the means of causing the establishment in England a few years back of a society for its introduction; but neither here nor in Germany, where it has occasionally been employed, has the practice being adopted, save in a very few instances, most of which seem to have been merely experimental. In Calcutta cremation is still practised to some extent by the native population; the process being very effectively carried out by a French company, which has been established for some years. We may mention here an important modification of the ordinary form of interment proposed by Mr Sydney Hadden. Mr Hadden's proposal is to dispense with the coffin, and to place the corpse instead in a large wickerwork receptacle filled with flowers, then inter it.

Of the three modes of disposal of the dead, viz. by burial, by burning, and by consignment to the sea, the first, as we have already said, is the almost invariably prevalent custom amongst civilised communities. That in a sanitary point of view it is less to be commended than either of the other methods is, we think, not difficult of demonstration. When a body is burned the resulting gaseous products of combustion, which most probably consist mainly of carbonic acid, carbonic oxide, and nitrogen, diffuse harmlessly into the atmosphere, and there remains behind only the calcined bones which formed the skeleton. An experiment by Sir Henry Thompson has shown that cremation may be performed without giving rise to odour of any kind at a comparatively small expense, and within a very moderate space of time. He burned a body weighing 227 lbs. in fifty-five minutes by placing it in a cylindrical metallic vessel seven feet long and six feet in diameter, previously heated to incandescence. The evolved gases were made to pass over a large surface of strongly heated fire-bricks, which formed part of the furnace in which the metallic vessel was placed. The furnace and its fittings were designed by Dr Siemens. The remaining ashes weighed about 5 lbs. In his pamphlet 'On Cremation,' Sir Henry Thompson has proposed that the custom, if adopted, should be carried out in the following manner: "When death occurs, and the necessary certificate has been given, the body is placed in a light wood shell, then in a suitable outside receptacle preparatory to removal for religious rites or otherwise. After a proper time has elapsed it is conveyed to the spot where cremation is to be performed. There nothing need be seen by the last attendant or attendants than the placing of a shell within a small compartment, and the closing of the door upon it. It slides down into the heated chamber, and is left there an hour until the necessary changes have taken place. The ashes are then placed at the disposal of the attendants." Sir Henry suggests that, previous to the burning of any corpse, proper officers appointed for the purpose should examine into and certify as to the cause of death, and if satisfied that it has resulted from natural events, that they should give the certificate he alludes to.

Sir Henry Thompson proposes that the functions of the officers appointed for this purpose should be the same as those of the _medicins verificateurs_, who are medical inspectors appointed by the municipality of Paris and the other large cities, whose duty consists in visiting each house where a death occurs, in assuring themselves that the person is really dead, and that there are no suspicious circumstances attending the demise.

In Paris alone there are more than eighty of such medical functionaries.

Burial by casting the corpse into the depths of the sea possesses the great advantage over ordinary interment of removing it from near the habitation of man, whilst the sea water, by its antiseptic properties, would be as little favorable to the dissemination of noxious putrescent compounds as cremation is. On the contrary, if the dead are disposed of by the ordinary method of burial, the objectionable effects arising from their decomposition in the earth are, under the most favorable conditions, only partially overcome; and the reason is obvious, since whilst deep-sea burial prevents animal decay altogether, and burning destroys the body, which, if not got rid of, would become putrid; burial in the earth permits its slow and lengthened decomposition to go on unchecked, and to thus very frequently become a source of contamination and danger to health.[251]