INDEX 



Absorbents, 160. 



Absorption, of heat by soils, 47; of 



gases by soils, 320. 

 Absorptive power of soils, 47, 51. 

 Acid phosphate, preparation of, 323. 

 Acids in plant roots, 258. 

 Acid soils, 1 01. 



Acid soluble matter of soils, 81, 320. 

 Aeration of soils, 275. 

 Aerobic ferments, 177. 

 Agricultural geology, 54. 

 Agronomy, 9. 

 Air and soil formation, 60. 

 Air movement through soils, 314. 

 Albite, 65. 

 Alchemy, i. 

 Alkaline soils, 96. 

 Alkali soils, improving, 99. 

 Aluminum of soils, 78. 

 Amendments, soils, 233. 

 Ammonium compounds, 130. 

 Ammonium sulphate, 155. 

 Anaerobic ferments, 177. 

 Analysis of soils, how made, 87; 



value of, 88, 90; interpretation of, 



91-92. 



Apatite rock, 67. 

 Apparatus, list of, 308. 

 Application, of fertilizer, 252; of 



manures, 181, 184. 

 Arrangement of soil particles, 18. 

 Ashes, 218; action of, on soils, 219; 



testing of, 324. 

 Assimilation, of nitrogen, 116; of 



phosphates, 199. 

 Atmospheric nitrogen, 118. 

 Atwater, 122, 151. 



Availability of plant food, 92. 

 Available nitrogen, 128, 152. 

 Available phosphate, 203, 210. 



Bacterial action and cultivation, 138, 



298. 

 Barley, fertilizers for, 253; food 



requirements of, 261. 

 Blood, dried, 147. 

 Bone, dissolved, 208; steamed, 208; 



fertilizers, 207. 

 Bone ash, 208. 

 Bone black, 209. 

 Boussingault, n, 119, 120. 

 Buckwheat, food requirements of, 266. 



Calcium as essential element, 223. 



Calcium carbonate, and nitrification, 

 140; compounds of soils, 79; ni- 

 trate and cyanamid, 156; phos- 

 phate, 68. 



Capillarity, 30; and cultivation, 36. 



Capillary water, determination of, 

 312. 



Carbon, of soil, 74; sources for plant 

 growth, 74. 



Cavendish, 2. 



Cereal crops, 259. 



Chemical composition of soils, 71. 



Chlorine of soil, 75. 



Citric acid, use of, in soil analysis, 84. 



Classification, of soils, scheme for, 

 326; of elements, 71. 



Clay, formation of, 67; particles, 16; 

 sedimentation of, 317. 



Clover, as manure, 154; nitrogen 



345 



