INDEX. 



Absorption and displacement, law 



of 336 



Absorptive power of soils 333 



" " cause of.343, 354 



" " " significance 



of 3-4 



Acids in soil 223 



" absorbed by soils 353 



Adhesion 165 



Adhesiveness of soils 184 



Air, atmospheric, composition of. . 21 

 " within the plant, composition 



of 45 



Alkali-salts, solvent effect of 130 



AUotropism 06 



Alluvium 145 



Aluminum, alumina. 107 



Amides 276 



Amide-like bodies 277, 300 



Ammonia 49, 54 



absorbed by clay.... 243, 267 



" " " peat 300 



" " " plants... .56, 98 



" condensed in soils 240 



" conversion of into nitric 



acid 85 



" evolved from flesh, decay- 

 ing under charcoal 169 



" fixed by gypsum 244 



" in atmosphere 54 



" " " how formed. 77, 85 



" of rain, etc 60 



" of the soil, formation of.239 

 " " " chemically 



combined. 243 

 " " " physically 



condensed. 240 



" " " quantity of.. 248 



" " " aolnbility of. 246 



" ♦' " volatility of.. 244 



11 



Ammonia-salts and nitrates, nutri- 

 tive value of 300 



Amphibole 113 



Analysis of soils, chemical indica- 

 tions of 368 



" mechanical 147 



Apatite .. 116 



Apocrenates 231 



Apocrenic acid 237, 229 



Argillite 119 



Ash-ingredients, quantity needful 



for crops 363 



Atmosphere, chemical composi- 

 tion 21, 22 



" physical constitution.. 99 



Atmospheric food, absorbed 99 



" " assimilated — 97 



Barley crop, ash ingredients of. 364 



Basalt 120 



Bases, absorbed by soils 335, 359 



Bisulphide of iron 115 



Burning of clay 185 



Calcite 115 



Capillarity 175, 199, 201 



Carbohydrates in soil 222 



Carbon, fixed by plants 43, 48 



" in decay 291 



" supply of 93 



Carbonate of lime 113, 162 



" " magnesia 115,162 



Carbonic acid 38 



" " absorbed by soil 221 



" plants.41, 



45, 98 

 " " exhaled by plants.. 43, 99 



" " in the soil 218 



" " " water of soil.. 220 



" " quantity in the air.40, 



47, 94 

 " " solubility in water.4U,13(J 



