INDEX 



Absorption of salts by soil, 247 



Acid soils, 32, 50, 171, 197, 240, 

 281 



Aerobic bacteria, 195 



Alinit, 198 



Alkali soils, 284 



Alluvial soils, 323 



Alluvium, 12 



Altitude, effect on temperature, 153 



Alvvay, soil-water required for crops, 

 96, 112 



Ammonia, absorption by soil, 250 ; 

 formation from urea, 196 ; in soil, 

 221 ; salts, removal of lime by, 

 252, 259 



Anaerobic bacteria, 199 



Analysis, available constituents, 177 ; 

 chemical, 159; interpretation of, 

 171, 183 ; mechanical, 35, 55 ; of 

 soil by plant, 176 



Anbury in turnips, 240, 244 



Angus Smith on denitrification, 226 



Anti-cyclones, reversal of tempera- 

 ture in, 153 



Antiseptics, effect of on soil, 233 



Apatite, 24 



Arid soils, characteristics of, 3 1, 51 



Assimilation and transpiration, 101 



Atwater on fixation of nitrogen, 204 



Augite, 21 



Autumn cultivation, gain of water 

 by, 106 



Available plant food in the soil, 177, 

 181 



AzOtobacter chroococcum, 213 



Bacteria in soil, 4, 192, 233 ; 



denitrifying, 226 ; nitrifying, 218 ; 



iron, 239; nitrogen fixing, 199 

 Bailey-Denton on effect of drainage 



on temperature, 151 



347 



Bare fallows, 96, 125, 130, 225, 328 

 Basalt, weathering of, 22 

 Beaumont, E. de, on antiquity of 



soil, 33 

 Beijerinck on Azotobacter, 213 

 Benetzungs-warme, 98 

 Berthelot on fixation of nitrogen, 



204, 212 ; and Andre on nitrogen 



in humus, 52 

 Black soils, 32, 52, 273 

 Bog iron ore, 26 

 Boulder clays, 16 

 Boussingault on source of nitrogen 



in plants, 200, 202 

 Brick earth, 13, 15 

 Brown on energy absorbed in 



assimilation, 101 

 Brownian motion, 43 



Calcareous soils, 325 



Calcifuges, 320, 332 



Calcium carbonate, 23, 46, 170; 



aids decay of organic matter, 198 ; 



determination of, 164 ; in soils 



subject to " finger-and-toe," 245 ; 



removal by manures, 252 

 Capacity of soil for water, 73, 87 

 Capillarity, 77 ; supply of water to 



crop by, III, 118 

 Carbohydrate and nitrogen fixation, 



214 

 Carbon, determination of, 163 

 Carbon to nitrogen in soils, ratio 



of, 51 

 Carbonic acid in soil gases, 13 ; 



excreted by roots, 179 ; and water, 



action on rock minerals, 13 

 Catch crops, 122 

 Chalk, 46; " pipes" in, due to 



weathering, 24 ; soils, 325 

 Chalking, 304 



