Chapter C

Calcium, 18
microchemical examination, 264

Caldwell, preliminary treatment of soil samples, 88

Capillary attraction, determination, 145
movement of water, 153

Carbazol, reagent for nitric acid, 548

Carbon, 5
comparison of methods for estimating, 321
dioxid, diffusion in soils, 297
estimation in water, 579
in soils, apparatus for estimating, 293
occurrence in soils, 289
solvent for soils, 343
estimation of organic, 315
oxidation with chromic acid, 316
permanganate, 318

Carbonates, Belgian method, 342
deficiency in soils, 340
estimation, 337

Carnot, method for manganese, 397
phosphoric acid, 403

Chabrier, method for nitrous acid, 565

Chemical analysis of soils, 301–575
order of examination, 302
preliminary considerations, 301
elements in soils, 2

Chevreul, ammonium phosphate in guanos, 7

Chile, nitrate deposits, 15, 16

Chlorin, 6
estimation, 422
in water, 577
Mohr’s method, 424
Petermann’s method, 424
Wolff’s method, 423

Citric acid, solvent for soils, 344

Clarke, relative abundance of elements, 23

Classification of soils, 52

Clay, chemical nature, 232
colloidal, 231
mechanical determination, 242
properties, 223
separation, 230
suspension, 176

Clayey soils, effect of boiling on texture, 244–246
elutriation, 239

Cleavage of soil particles, 262

Coefficient of evaporation, determination, 144–146

Cohesion and adhesion of soils, 116, 117

Colloidal clay, estimation, 231

Color of rocks, 31
soil, determination, 97

Colorimetric comparison, delicacy, 548, 559

Compact soils, 90

Conductivity of soils, 115

Copper, estimation, 591
-zinc couple for nitric acid, 540, 542

Crenic acid, 61

Crum-Frankland process, 518

Crystal angles, measurement, 259

Culture media, composition, 468, 473, 474, 476, 479, 481, 483, 484, 486
solid, 479, 481