INDEX OF SUBJECTS. 



721 



Purification of water, by chemicals, 208 



heat, 208 



ozone, 207 

 Putrescin, 115 



RABIES, serum for, 485 



vaccine, 473 

 Radium rays, 165 

 Ragi, 447 



Rain, microorganisms in, 198 

 Rate of oxidation, 231, 244 



carbon in soil, 231, 244 



hydrogen, 231 



nitrogen in soil, 231, 244 

 Reaction of soil, 235 

 Reduction of, nitrates, 96, 118, 217, 264 



nitrites, 218, 264 



sulphate, 96, 119, 217, 289 

 Refrigeration, 158, 395 



after-storage changes, 397 



of butter, 400 



chilling changes, 395 



of eggs, 399 



of fish, 397 



of food-stuffs, 395 



of fruits, 400 



legal control of, 401 



of meat, 397 j 



of milk, 400 



of poultry, '397 



storage changes, 396 



of vegetables, 400 

 Resistance of spores, 160 

 Retting, 465 

 Rice beer, 443 

 Ripening of milk, 350 

 Rivers, microorganisms in, 200 

 Ropy milk, 325 

 Rotation of elements, 127 



SAKE, 443 



Sand filter, 205, 222 



life in, 221 

 Saprophytes, 76 



cosmopolitan, 16 



facultative, 521 



obligate, 17, 76, 521 

 Sauerkraut, 462 

 Schizogony, 73 

 Sclerotium, 13 



Seasonal influence on soil, 232 

 Sea water, microorganisms in, 201 

 Sedimentation, influence on germ content 



of water, 202 

 Septic tank, 224 

 Septum, 12 

 Serum, antidiphtheritic, 480 



46 



Serum, antidysenteric, 485 

 antigonococcic, 485 

 antimicrobial, 484 

 antirabic, 485 

 antistreptococcic, 484 

 Dorset-Miles, 484 

 Sewage, anaerobic organisms, 213 

 fermentation of, 214 

 cellulose, 215 

 fats, 216 

 proteins, 214 

 urea, 214 

 filters, 223 



microorganisms of, 212 

 cultivation of, 222 

 destruction by biological pro- 

 cesses, 224 



by chemical processes, 225 

 life in filters of, 221 

 longevity of pathogenic organism 



in, 220 



oxidizing bacteria of, 218 

 pathogenic bacteria in, 220 

 prevalence of pathogenic, 220 

 reduction of nitrates, 218 

 nitrites, 218 

 sulphates, 217 

 septic tank for, 224 

 streptococcic in water, 194, 204 

 tanks, 224 



Side-chain theory of immunity, 574 

 Skatol, 114 

 Skin, 545 

 Slimy milk, 325 

 Smallpox, vaccine, 470 

 Snow, microorganisms in, 119 

 Soil, acidity, 235 



causes of, 236 



number of organisms, influenced 



by, 236 

 range of, 235 



species, influenced by, 236 

 aeration, 230 

 aerobic activities, 231 

 algae in, 239 

 aluminum in, 291 

 ammonia formation, 254 

 transformation, 266 

 ammonification, 253 



climatic conditions influencing, 



254 



efficiency of different species, 256 

 experimental study, 253 

 mechanism of, 254 

 numbers involved, 256 

 species involved, 256 

 anaerobic activities, 231 



