INDEX 



Absorption of salts by soli, 211. 



Acid soils, 44, 204, 242. 



Aerobic bacteria, 1 71. 



Alinit, 174. 



Alkali soils, 245, 272. 



Alluvial soils, 279. 



Alluvium, 12. 



Altitude, effect of temperature, 133. 



Alway, soil- water required for crops, 

 86. 



Ammonia, absorption by soil, 214; 

 formation from urea, 172 ; salts, 

 removal of lime by, 216, 224. 



Anaerobic bacteria, 174. 



Analysis, available constituents, 158 ; 

 chemical, 1 39 ; interpretation of, 

 151, 165 ; mechanical, 32, 50; of 

 soil by plant, 155. 



Anbury in turnips, 204, 208. 



Angus Smith on denitrification, 197. 



Anticyclones, reversal of tempera- 

 ture in, 134. 



Apatite, 24. 



Arid soils, characteristics of, 46. 



Assimilation and transpiration, 90. 



Atwater on fixation of nitrogen, 179. 



Augite, 21. 



Autumn cultivation, gain of water 



by, 95. 

 Available plant food in the soil, 157, 



164. 

 Azotobacter chroococcum, 187. 

 805 



BACTERIA in soil, 4, 168 ; denitri- 

 fying, 197 ; nitrifying, 191 ; iron, 

 203 ; nitrogen fixing, 174. 



Bailey-Denton on effect of drainage 

 on temperature, 132. 



Bare fallows, 86, 112. 



Basalt, weathering of, 21. 



Beaumont, E. de, on antiquity of 

 soil, 29. 



Beijerinck on Azotobacter, 187 



Benetzungs-warme, 88. 



Berthelot on fixation of nitrogen, 

 179, 186 ; and Andre on nitrogen 

 in humus, 47. 



Black soils, 235. 



Bog iron ore, 25. 



Boussingault on source of nitrogen 

 in plants, 175, 177. 



Brick earth, 13, 15. 



Brown on energy absorbed in 

 assimilation, 90. 



Brownian motion, 38. 



Calcareous soils, 281. 



Calafuges, 276, 288. 



Calcium carbonate, 22, 40 ; aids 



decay of organic matter, 173 ; 



determination of, 144 ; in soils 



subject to " finger-and-toe," 209; 



removal by manures, 216. 

 Capacity of soil for water, 67. 



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