570 



INDEX OF SUBJECT MATTER 



Carbon, loss from the soil, data of, 402. 



loss of from soil, 555. 



use of organic carbon by higher 

 plants, 402. 

 Carbon cycle of the soil, loss of carbon 

 from, 400. 



nature of, 399. 



organisms of, 399. 



products of, 400. 

 Carbon dioxide, a measure of bacterial 

 activity, 256. 



from decaying manure, 509. 



from lime, 369. 



function in soil, 255. 



in atmospheric air, data, 110. 



in soil air, data, 110. 



influence on nitrification, 256, 419. 



relation to mineral cycle of soil, 408. 



of soil air, 250. 



of soil air, influence of farm manure 

 on, 254. 



of soil air, influence of organic mat- 

 ter on, 253. 



production of, 110. 



produced by bacteria in soil, 252. 



produced by plant roots, 252, 295. 



source of in soil air, 251, 400. 

 Carbonated lime, 365. 

 Carbonation, influence in soil formation, 



26. 

 Carbonized materials in soil, importance 

 of, 112. 



nature of, 111. 

 Castor pomace, composition of, 446. 

 Catalytic fertilizers, 466. 

 Catalyst defined, 103, 135. 

 Cell sap, nature of in relation to plant 



absorption, 300. 

 Centrifugal mechanical analysis of soils, 



71. 

 Character of soil particles, 69. 

 Chemical absorption by soils, 263. 

 Chemical analysis, alluvial and upland 

 soils, 49. 



arid and humid soils, 31. 



bulk and extraction methods, 311. 



by digestion with strong acids, 316. 



by water extraction, 319. 



glacial soils, 57. 



granite soil, 33. 



importance in fertility evaluation, 



soils, 



311. 



326. 



Chemical analysis, limestone soil, 33. 

 loess soils, 63. 

 marine soils, 52. 

 of alkaline river water, 334. 

 of Cornell soils, 325. 

 of good and poor Ohio soils, 326. 

 of Minnesota soils, 316. 

 of Minnesota and Maryland 



317. 

 of soil, popular conception of, 

 of soil separates, 78, 79. 

 peat and muck, 44. 

 residual soils, 41, 52, 57. 

 resume as to value of, 326. 

 value as shown by actual data, 

 with weak acids, 317. 

 Chemical composition of soils, compared 



to lithosphere, 13. 

 Chemical composition of soil separates, 



78, 79. 

 Chemical effects of lime on soil, 371. 

 Chromic acid method for determination 



of soil organic matter, 113. 

 Chile salt petre, source and character of, 



448. 

 Classification of methods of mechanical 



analysis, 72. 

 Classification of soils, geological, 38. 



for soil survey, 85. 

 Classification of soil particles, Bureau of 



Soils, 67. 

 Classification of soil particles other than 



Bureau of Soils, 68. 

 Climate, effect on transpiration, 191. 

 relation of to soil formation, 30. 

 Clostridium pastorianum in soil, 431. 

 Coastal plain soils, chemical composition 



of, 52. 

 Cohesion, cause of in soils, 136. 



defined, 136. 

 Colloidal materials, properties of, 130. 



in soils, 265. 

 Colloidal matter, absorptive power for 



water, 153. 

 Colloidal matter, influence on soil prop- 

 erties, 135. 

 Colloidal matter in soils, influence on 

 structure, 137. 

 estimation of, 134. 

 generation of, 132. 

 resume of, 138. 

 Colloidal particles, size of, 128. 



