INDEX 



Soil, oxidation of hydrogen, 351, 377 



methane, 377 



nitrogen, 351, 374 

 peptone, transformation of, 398 

 phosphorus, 374, 420 

 plants (higher in), 367 

 potassium, 424 

 production of hydrogen, 375 



methane, 375 

 protein bodies in, 380 



amount, 380 



quality, 380 

 protozoa in, 364 

 reaction of, 355 

 reduction of nitrates, 394 



sulphates, 423 



seasons, influence of, 352, 368 

 sterilization of, 366 

 sulphate reduction, 423 

 sulphofication, 423 

 sulphur, 374, 421 

 temperature relations, 352 

 temperatures of, 352 

 transformation of nitrogen com- 

 pounds, 383, 398 



organic acids, 380 



reactions of, 355, 372 

 weatheiing process, 417 

 Soluble enzymes, 214 



toxins, 676 

 Solutions, 156 



alkalinity of, 161 



colloidal. 157, 179 



crystalloidal, 158 



diphasic, 157 



disperse phase of, 157, 179 



dispersion means of, 157, 179 



dispersoids, 157, 179 



electrolytic, 158 



emulsoid, 157, 179 



heterogeneous, 157 



homogenous, 157 



hydrogen ion concentration of, 162 



influence of, 265 



neutrality of, 161 



non-electrolytic, 158 



Solutions, one-phase system, 157 



polyphase, 157 



reaction of, 160 



solute, 157 



solvent, 157 



suspensoid, 157, 179 



true, 156 

 Solvent, 157 

 Somatose, 523 

 Sources of organic acids in soil, 379 



carbon for microorganisms, 222 



hydrogen for microorganisms, 223 



infection, 664 



microorganisms in milk, 434 



minerals for microorganisms, 224 



nitrogen for microorganisms, 223 



oxygen for microorganisms, 223 

 Special milk, 432 

 Specific inhibition, 719 

 Spindle, achromatic, 28 

 Spireme, 28 

 Spirilliaceae, 107 

 Spirillum, desulphuricans, 424 

 in sewage, 336 



rubrum, flagella, 25, 105 



rugula, in sewage, 334 



sputigenum, 594 



undula, 105 



volutans, cilia of, 107 



metachromatic corpuscles of, 101, 



102 

 Spirochaeta, anserina, 904 



buccalis, 594, 900 



dentium, 900 



duttoni, morphology, 902 



gallinarum, 904 



macrodentium, 594, 595 



media, 594 



microdentium, 594 



pallida, in mouth, 595 

 in luetin preparation, 753 



recurrentis, in relapsing fever, 900, 

 901 



vincenti, 900 

 Spirochaetes, 107 



cell aggregates, 108 



