426 



INDEX 



Anabolism, bacterial, 7 1 



Ana rrobes, 69 



Animals and plants, differences in, 29 



Anthrax, organism discovered, 24 



vaccine, 25 



Antiseptic action on ammonifiers, 130 

 on bacterial activities of soil, 127, 



128 



on oxidation in soil, 130 

 on plants, 128 

 on soil, 127 



theories concerning, 133-138 

 Grieg Smith's, 138 

 Hiltner's and Stormer's, 



133 



Koch's, 133 

 Russell's and Hutchinson's, 



135, 136 



definition of, 110 

 Antitoxins, 415 

 Arsenic, action in soil, 120 

 influence of aeration of soil on 



toxicity of, 125 

 on ammonification, 119 

 on azofication, 120 

 on Azotobacter, 261 

 on bacterial activities, 118-126 

 on nitrification, 119 

 on soil phosphorus, 122 

 occurrence in soils, 1 18 

 solubility of, 118 

 Ash of bacteria, 69 

 Aspergillus, influence of salts on, 67 

 Azofication, 248-289 

 definition of, 249 

 history of, 248-252 

 influence of aeration on, 281, 282 

 of climate on, 283-284 

 of colloids on, 260, 261 

 of crop on, 282, 283 

 of light on, 281 

 of manure on, 266, 267 

 of reaction on, 254-256 

 of season on, 281, 282 

 of temperature on, 278-281 

 of water on, 276-278 

 methods of studying, 272-274 

 Azofiers, distribution of, 252-254 

 food requirements of, 256-259 

 influence of organic substances on, 



259-261 



metabolism of, 267-271 

 morphology of, 271, 272 

 pigment production by, 270, 27 1 

 relationship to nitrate accumulation, 



284 



to other microorganisms, 274-276 

 soil gain in nitrogen from, 287-289 



inoculation with, 284-287 

 source of energy for, 261-266 

 Azotobacter agilis, 251 



occurrence in water, 254 

 ash of, 268 



Azotobacter beijerinckii, 251 



influence of manure on, 266 

 calcium requirements of, 259 

 carbonic acid generated by, 177 

 chroococcum, 251 



calcium carbonate on, 255 



formation of calcium carbonate 

 by, 173 



humates on, 265 



manure on, 266 



methods of growing, 272 



morphology of, 271 



pigments of, 270, 271 



physiology of, 272 



radium rays on, 103 



soil inoculation with, 284-287 

 composition of, 59, 60 

 distribution, 252, 253 

 food of, 256-259 

 index of lime requirements, 254 



of phosphorus requirements, 258 

 influence of aeration on, 281 



of aluminum on, 259 



of antiseptic on, 137 



of arsenic on, 121, 122, 261 



of carbon bisulphid on, 128 



of carbonates on, 254-257 



of climate on, 283 



of colloids on, 259 



of drying on, 106, 276 



of green manures on, 157 



of humus on, 266 



of light on, 281 



of manganese on, 259 



of nitrates on, 256, 257 



of phosphorus on, 176, 177 



of season on, 281, 282 



of sodium on, 256 



of temperature on, 278, 279, 280 



of water, 276, 277 

 in fallow soil, 335 

 iron requirements of, 259 

 isolation of, 251 

 life cycle of, 272 

 metabolism of, 267-270 

 nitrogen of, 268 



fixed in different media by, 273, 



274 



phosphorus requirements of, 257-259 

 potassium requirements of, 257 

 products of, 86 



relationship to cellulose ferments 

 257 



to higher plants, 276 



to other organisms, 274-276 

 soil gains in nitrogen due to, 289 

 sulphur requirements of, 258, 259 

 symbiosis amongst, 276 

 utilization of cellulose by, 263 

 vinelandii, 251 



composition of, 60 



forms of nitrogen in, 267, 268 



nitrogen fixed by, 264 



