Chapter D: Darton, Florida phosphates, 9

Davidson, origin of Florida phosphates, 7

Decay of rocks, 43–52

Deherain, measurement of percolation, 167–169

Desiccator, drying, 309

Devarda’s method for nitric acid, 534
variation of Stoklassa, 535

Diffusion of gases, general conclusions, 299

Dietrich’s elutriator, 209

Digestion of soil, 456
vessels, 347

Dilution method, experiments, 483, 485

Diphenylimid, reagent for nitric acid, 549

Diphenylamin, reagent for nitric acid, 553

Distillation, prevention of bumping, 441

Dobeneck, method of determining absorption, 287–290

Drainage, influence on porosity, 132

Durham, clay suspension, 176

Dyer, citric acid solution, 344

Dyer, method for assimilable phosphoric acid, 410

E

Earth worms, action, 49

Eldridge, Florida phosphates, 10

Elements, different, simultaneous estimation, 425
relative abundance, 23

Elutriating tube, 236

Eruptive rocks, 41, 42

Estimation of gases in soils, 282–299

F

Ferric oxid, estimation, 353, 356, 357, 362, 399, 401

Fine soil, capacity for holding water, 135

Fish as fertilizer, 14

Flocculation, 171
effect of chemical action, 177
theory, 177

Floccules, destruction, 175

Florida phosphates, origin, 7–12

Fluorin, 17–24

Forchhammer, agricultural value of fucoids, 13

Frear, method of determining soil temperatures, 111

Freezing and thawing, 44

Fuchs and De Launy, origin of potash deposits, 21

Fuelling, determination of water absorption, 139

G

Gases, collection, 291
methods of study, 283
passage through the soil, 149, 150
determination, 150
relation to soil composition, 282

Gasparin, method of silt analysis, 195

Gautier, occurrence of oldest phosphates, 7

Gelatin, culture, 471–473
mineral, 473, 474

Gembloux station, method of soil solution, 350

German experiment stations, method of soil solution, 349

Glaciers, action, 45

Glucinic acid, 62

Goessmann, analysis of sea-weeds, 13

Gooch and Gruener, method for nitric acid, 546
estimation of boric acid, 580

Goss, method for phosphoric acid, 416–418

Grandeau, method of estimating humus, 324

H

Hands, sterilization, 489

Hannén, diffusion of carbon dioxid in soils, 297

Harada’s apparatus, 275

Heinrich, determination of passage of gases through soils, 150
water absorption, 143
method of determining cohesion, 116, 117

Henrici, determination of water capacity of soils, 143

Hilgard, alkaline soils, 55
digestion vessels, 347
humus estimation, 324
hygroscopic coefficient, 284
influence of surface tension, 174
method for soil solution, 348
of silt analysis, 225
methods of analysis of soil extract, 356–361
preliminary examination of soils, 87

Hilgard’s elutriator, 226
method, comparison with Osborne’s, 239

Hooker’s method for nitric acid, 548

Humic acid, 61, 62
estimation, 331

Humus, 60
combustion, 589
estimation, 324
German method, 333
method of Pasturel, 336
Raulin, 334
Van Bemmelén, 332
summary of results, 330
mineral contents, 589

Huston and McBride, humus estimation, 326
method of determining soil absorption, 128

Hydrochloric acid, solvent for soils, 344
strength, 345
time of digestion, 345
treatment of soil with cold, 350

Hydrofluoric acid, solvent for soils, 352

Hydrogen, 5
estimation of organic, 323

Hygroscopic coefficient, determination, 284