Chapter VIII: Introduction: Chap. I. The Discovery of Radium; its Extraction.—Chap

II. The Radium Emanation.—Chap. III. Physical Effects (Electrical and Magnetic).—Chap. IV. Physical Effects (continued).—Chap. V. Chemical Effects.—Chap. VI. Actions on Animal Life and Living Tissues.—Chap. VII. Other Radio-active Elements.—Appendix.—Experimental Apparatus.

PERCIVAL MARSHALL & CO.,

26–29, POPPIN’S COURT, FLEET STREET, LONDON, E.C.

* * * * *

RADIUM SPINTHARISCOPES.

AS DESIGNED BY

SIR WILLIAM CROOKES, F.R.S.,

For Demonstrating the Radio-activity of Radium.

KUNZITE.

THE NEW MINERAL.

Responding in a high degree to the Emanations from Radium.

ZINC SULPHIDE SCREENS.
CALCIUM SULPHIDE—Phosphorescent.
ZINC SULPHIDE—Phosphorescent.
PITCHBLENDE—Specimens.

_Write for particulars to_
JOHN J. GRIFFIN & SONS, Ltd.,
20, 22, 24, 26, SARDINIA STREET, LONDON, W.C.

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RADIUM APPLICATORS

Its employment in Therapeutics
and for scientific research.

(MacLeod) Surface, each =7s. 6d.= Throat, =£1 1s.=

=BARIUM PLATINOCYANIDE SCREENS=, per sq. inch, =9d.=

=CALCIUM SULPHIDE=, luminous, per lb., =8/-=

=KUNZITE=, per Gm., =1/-=

=POLONIUM, ON BISMUTH & COPPER DISCS=, each =25/-=

=PITCHBLENDE=, specimens, each, per oz., =2/6.=

=URANIUM NITRATE=, oz., =1/-.=

=THORIUM HYDROXIDE=, oz., =4/-=; lb., =48/-.=

=THORIUM HYDROXIDE PADS=, each =10/6.=

=WILLEMITE=, Natural Specimens, =2/-= each.

=WILLEMITE=, Artificial Specimens, =1/-= each.

=ZINC SULPHIDE=, Active, Gm. =1/6.=

=ZINC SULPHIDE SCREENS=, 10 × 10 centimetres, each =7/6.=

=Special Quotations for Quantity.=

=CHEMICALS AND APPARATUS=
=for Scientific Research.= (_Write for Price List._)

SPINTHARISCOPES
_showing the Scintillations of Radium_,
=21/-=

=W. MARTINDALE=, Manufacturing Chemist,
=10 NEW CAVENDISH STREET, W.=

_Telegraphic Address: “Martindale, Chemist, London._”
_Telephone: 1797 Paddington._

* * * * *

RADIUM

ON SALE AND LET ON HIRE.—Write for Terms.

=The following can be had by return of post.=

=Pitchblende=, direct from Joachimsthal, very radio-active, from =1/-=
to =30/-= per piece.

=Itacolomite=, or flexible sandstone, =10/-= to =25/-= per piece (very
rare).

=Kunzite, 1/-= per gramme. Selected, clear, =2/-=

=Sparteite= (see NATURE, 31 3/04, fol. 523), =2/-= and upwards.

=Chlorophane, 2/-= and upwards. =Barium Platino Cyanide in large
Crystals= in course of manufacture. (ORDERS BOOKED).

=Zinc Sulphide.= Phosphorescing a beautiful Green, =2/6= per tube.

=Zinc Sulphide.= Phosphorescing a beautiful Yellow, =2/6= per tube.

=Calcium Sulphide= Phosphorescing a beautiful Violet, =1/-= per tube.

=Radio-active Residue= from which Radium is made; very scarce, =2/-=
tube.

=Polonium Sulphide=, in tubes of one gramme, =21/-=

=Polonium= on Bismuth Rod or Disc, =25/-=

=Polonium= on Copper Rod or Disc, =25/-=

=Radio-active Screens= (Willemite), =6d.= per sq. inch. Plat. Bar.
Cyan Screen., =9d.= sq. inch

=Radio-active Screens= (Zinc Sulph.), 10 × 10 cm. =7/6.=

* * * * *

_Professional Men, Universities, Schools, &c., allowed special terms._

* * * * *

=Our newly invented Thorium Inhalers may be had on hire.=

* * * * *

ARMBRECHT, NELSON & CO.,
_71 & 73, Duke Street, Grosvenor Square, London, W._
Telephone: GERRARD 4942.

* * * * *

N.B.—We have to-day received a consignment of the New Zealand Vegetable Caterpillar; it is from 2 to 3 inches long, with a stem showing fructification growing out of its head. Scientific name of the insect is _Hepialus virescens_; the name of the fungus is _Sphaeria Robertsiana_. Specimens may be had from =10/6= to =21/-=, according to quality and size.

TERMS CASH WITH ORDER.

_Goods may be returned if not approved of, when money will be refunded._

------------------------------------------------------------------------

TRANSCRIBER’S NOTES

1. Silently corrected typographical errors and variations in spelling. 2. Anachronistic, non-standard, and uncertain spellings retained as printed. 3. Enclosed italics font in _underscores_. 4. Enclosed bold font in =equals=. 5. Superscripts are denoted by a caret before a single superscript character or a series of superscripted characters enclosed in curly braces, e.g. M^r. or M^{ister}. 6. Subscripts are denoted by an underscore before a series of subscripted characters enclosed in curly braces, e.g. H_{2}O.

End of Project Gutenberg's Radio-Active Substances, by Sklodowska Curie