516 



INDEX 



PAGE 



Capillary water, relation to texture 144 



Relation to structure 151 



Supplies plants 142 



Carbonates, of alkalies, affect soil 



structure 118 



Carbon, as plant-food element.. . . 3 



Carbon, in humus 123 



Carbon dioxide in relation to or- 

 ganic matter 361 



Carbon dioxide in soil air 438 



Carbonate of calcium, effect on soil .352 



Case-hardening 101 



Caustic lime, effect on soil 352 



Cellulose, decomposition by bac- 

 teria 405 



Cementation of granules 106 



Cementing materials 99 



Cereal crops, absorption of nutri- 

 ents 294 



As green manures 387 



Chain harrow, use of 4S6 



Chamberlin and Salisbury, char- 

 acter of minerals 8 



Characteristics of minerals 8 



Characteristics of the soil 2 



Checking and formation of gran- 

 ules 106 



And moisture content 106 



Checking of soil 98 



Relation to evaporation 99 



Relation to drying 106 



Relation to weakness 106 



Chemical, agencies of rock decay. . 14 

 Chemical analysis of soil, complete 



solution 268 



Extraction by distilled water. .276 



Interpretation 270 



Manurial needs 270 



Permanent ferlility 269 



Strong hydrochloric acid 269 



Use of carbon dioxide for 275 



Use of organic acids 273 



Chemical composition of soils. ... 30 

 Chemical decay of rocks, decom- 

 position 14 



Chemical effects of organic matter. 131 

 Chemical precipitates, rocks. . .11, 12 

 Chemical processes in soil, depend- 

 ent on temperature 451 



Chemical properties of arid and 



humid soil 64 



Chert, influence on soil formation. 40 

 Chief groups of soils 67 



PAGE 



Citric acid, use in soil analysis. . . . 274 



Clark, abundance of minerals. ... 9 



Proportion of element in earth's 



crust 4 



Classes of manures 322 



Soil textural 74, 76 



Number of particles in 82 



Classification of rocks 10, 11 



Classification of soils 30 



Classification of soil textural 70 



Clay soil 74 



Clay soil, evaporation in checks. .197 



Organic matter in 125 



Climate, influence on percolation . 193 

 Humid conditions requiring 



irrigation 226 



Relation to irrigation practice. .224 



Clod-crushers, types of 489 



Clod, relation granule 91 



Cloth tent, effect on soil moisture. 214 



Cohesiveness of soil 98 



Cold and heat, agency of rock 



decay 18 



Cold soils, meaning of 462 



Colloidal clay and plasticity 97 



Colluvial soils, characters of 45 



Colors of soil 101 



Color of soil, affected by humus. . . 130 



Effect on temperature 456 



Commercial fertilizers 322 



Constituents 324 



Function 322 



Compacting soil, importance of 



drainage in 240 



Composition of alluvial soils . . . 52, 53 



Arid and humid soils 65 



Atmosphere 16 



Effect of roots on composition .437 



Escape of carbon dioxide 436 



Glacial soils 57 



Marine soils 49, 50 



Residual soils 32 



Rocks and residual soils 32 



Soil air 434 



Soil air, effect of carbon dioxide 



production on 435 



Soil-forming minerals 6,7 



Soil separates 85 



Soil, relation to rock 37 



Soil, relation to texture ...... 87 



Soils, chemical 30 



"Wind-formed soil 63 



Composting manure 380 



