INDEIX 



Absorbents 133 



Absorption of heat by soils . . 39 



of gases by soils . 269 



Absorptive power of soils . . . 43 



Acid soils 85 



Acid soluble matter, of 



soils. 65, 269 



Acids in plant roots 218 



Aeration of soils 250 



Aerobic ferments 147 



Agricultural geology 45 



Agronomy 8 



Air movement through soils -266 



Albite 52 



Alchemy i 



Alkaline soils 83 



Aluminum of soils 63 



Amendments, soils 196 



Amonium compounds 109 



salts 129 



Anaerobic ferments 148 



Analysis of soil, how made . 72 



value of 74, 78 



Apatite rock 54 



Apparatus, list of 262 



Application of fertilizer 212 



cf manures 151, 154 



Arrangement of soil parti- 

 cles 14 



Ashes 182 



action of, on soils .... 183 



testing of 272 



Assimilation of nitrogen .... 97 



of phosphates 165 



Atmospheric nitrogen 99 



Atwater 102, 125 



Availability of plant food. . . 77 



Avail able phosphates... 1 68, 175 



nitrogen 108, 126 



Bacterial action and cultiva- 

 tion 115, 252 



Barley, fertilizers for 213 



food requirements of. .220 



Blood, dried . . . .' 121 



Bone, dissolved 174 



fertilizers 173 



Boneash 1 73 



Bone-black 174 



Boussingault's experiments. 



ioo, 101, 399 



Calcium as essential element. 187 

 carbonate and nitrifi- 

 cation 116 



compounds of soils. . . 64 



phosphate 55 



Capillary water, determina- 

 tion of 263 



Capillarity 24 



and cultivation 29 



Carbon of soil 60 



sources for plant 



growth 60 



Chlorine of soil 61, 83 



Citric acid, use of in soil 



analysis 70 



Classification of soils, scheme 



for 273 



