INDEX 



89s 



Soil, nitrogen (atmospheric) fixation, 

 development of organisms, 

 346 



energy relations, 342 



entrance of organisms, 346 



environmental relations, 348 



inoculations, methods of, 350, 

 352 



mechanism, 348 



physiological efficiency, 347 



resistance of plants to, 347 



specialization of organisms, 348 



symbiotic, history of, 343 



symbiotic (non), history of, 339 



theories of, 338 



variations of, 348 

 organic acids, accumulation of ,319 



source of, 319 



transformation of, 319 

 organic matter in, 300 

 origin of, 356 



carbohydrates in, 315 



fats, 318 



waxes, 318 

 oxidation of carbon, 294, 313 



carbon monoxide, 317 



hydrogen, 294, 317 



methane, 317 



nitrogen, 294, 313 

 peptone, transformation of, 336 

 phosphorus, 314, 357 

 plants (higher in), 308 

 potassium, 360 

 production of hydrogen, 315 



methane, 315 

 protein bodies in, 320 



amount, 320 



quality, 320 

 protozoa in, 305 

 reaction of, 298 

 reduction of nitrates, 333 



nitrites, 383 



sulphates, 358 

 , seasons, influence of, 309 

 ',' r ,,sulphate reduction, 358 

 sulphur, 358 



Soil, temperature relations, 295 

 • temperatures of, 295 

 transformation of nitrogen com- 

 pqunds, 322, 336 

 organic acids, 319 

 reactions of, 298, 311, 312 

 weathering process, 354 

 Somatose, 456 



Sources of organic acids in soil, 319 

 carbon for microorganisms, 151, 



152 

 hydrogen for microorganisms, 



152, 153 



infection, 664 



microorganisms in milk, 369 



minerals for microorganisms, 152 



nitrogen for microorganisms, 151 



oxygen for microorganisms, 157 

 Specific gravity of bacteria, 1 50 

 Spireme, 28 

 Spirilliacese, 105 

 Spirillum, desulphuricans, 280, 360 



rubrum, 103 



rugula, 278 



sputigenum, 497 



undula, 87 



volutans, 99, loi, 104 

 SpirochEEta, 136, 845 ; 



anserina, 825 



buccalis, 497 



dentium, 497 



duttoni, 845 



gallinarum, 825 



macrodentium, 497 



media, 497 



microdentium, 497 



obermeieri, 845 



pallida, 498 



pallidula, 845. 



recurrentis, 847 



vincenti, 845 

 Spirochaetal diseases, 845 

 Spirochaetes, 105 



form, 105 



motility, 105 



reproduction, 105 



