INDEX OF SUBJECTS. 



719 



Mo to, 443 



Mouth, 546 



Must of grapes, 418 



Mutual influences, 181, 184 



Mycelium, 12 



NASAL cavity, 546 



Neurin, 115 



Neutral bacteria in milk, 312 



Nitrification, accumulation of nitrates, 262 



of ammonia, 84 



disappearance of nitrates, 262 



environmental relations, 260 



experimental study, 257 



nitric bacteria, 259 



nitrous bacteria, 259 

 Nitrogen, addition to soil, 245 



cycle, 126 

 Non-symbiotic nitrogen fixation, 269 



aerobic species, 270 



anaerobic species, 270 



energy relations, 270 



history of, 269 

 Noxious retention theory of immunity, 



574 



Number of bacteria in soil, 240 

 Nutrition of microorganisms, 81 



OBLIGATE, parasites, 76 



saprophytes, 7 6 

 Opsonic index, 556 

 Opsonins, 565 



hemo-, 567 



index of, 566 

 Opsonogens, 565 

 Origin of carbohydrates in soil, 246 



fats in soils, 249 



soil, 284 



waxes in soil, 249 

 Osmotic pressure, 147 

 Outlines of plant groups, 10 



of protozoal groups, 10. u 

 Oxidation, of alcohol, 93 



Of ammonia, 84 



bacteria, 218 



of carbon, 231, 244 



of carbon monoxide, 248 



of hydrogen, 231, 248 



of hydrogen sulphide, 92 



of hyposulphite, 84 



influence on organisms in water, 202 



of methane, 248 



of nitrites, 259 



of nitrogen, 231, 244 



rate in carbon, 231 



of sulphur, 93 



in water, 202 



Oxygen, influence on different species 

 94, 95 



PARACHROME bacteria, 120 



Parasitic molds, 17 



Parasites, facultative, 17, 76, 521 



obligate, 76, 521 



of uncertain position, 79, 689 

 Parenchymatous tissues, action of micro- 

 organisms on, 539 

 Pasteurization, of beer, 386, 439 



of cream, 342, 386 



economic importance of, 385 



of food, 385 



of fruit juices, 386 



of milk, 319, 386, 

 Pathogenic bacteria, in butter, 345 



in milk, 313, 329 

 Percentage index, 566 

 Perithecium, 14 

 Perry, 440 

 Phagocytic, index, 566 



theory of immunity, 575 

 Phagocytosis, 565 

 Phosphorus, cycle of, 128 



in soil, 245, 287 

 Phototaxis, 164 

 Photo tropism, 164 

 Phylogeny, 13 



Physical influences of microorganisms, 147 

 Physiological groups, 98 



of bacteria in soil, 24 



variation, 104 



Physiology of microorganisms, 81 

 Phy to toxins, 123 

 Pickles, 462 

 Pigment, 119 



bacteriopurpurin, 120 



carotin bodies, 121 



chromogens, 120, 121 



chromophorous bacteria, 120 



chromoporous bacteria, 120 



fluorescent, 120, 121 



parachrome bacteria, 1 20 



prodigiosin bodies, 121 



solvents, 121 

 Plant food in soil, 234 



groups, 10 

 Plasmolysis, 148 



colloidal substances, 150 



salt solutions, 149 



sugar solutions, 149 



water, 148 

 Poisoning, by cheese, 416 



chemical nature of, 417 



classes of food, 412 



due to saprophytic changes, 414 



