INDEX 



887 



Mouth, protection by, 690 

 Mucor, 22, 40, 42, 43, 48, 507, 558 



circineUoides, 41, 49 



javanicus, 49 



mucedo, 48 



oryzse, 72, 535, 537 



plumbeus, 49 



racemosus, 48 



rouxii, 49, 535 

 Mumps, 801 

 Must of grapes, 507 

 Mutual influences, 241 

 Mycelium, 36 

 Mycetoma, 730 

 Mycetozoa, 121 

 Mycoderma, 74 



aceti, 539 



vini, 75 

 Myconrhiza, 304 

 Mycotic lymphangitis, 731 

 Myonemes, 124 

 Myxobolus pfeifferi, 13 

 Myxosporidia, 136 



NASAL cavity, 690 " • 



Neurin, 171 



Neutral bacteria in milk, 385, 401 



Nipa cinerea, 644 



Nitrate disappearance, 332 



as food, 151 



reduction, 174, 279, 333 

 in sewage, 279 

 in soil, 333 



transformation, 322 

 Nitrification, accumulation of ni- 

 trates, 327, 332 



of ammonia, 332 



disappearance of nitrates, 332 



environmental relations, 329, 332 



experimental study, 327 



nitric bacteria, 329 



nitrous bacteria, 329 

 Nitrite reduction, 174, 279, 333 



in sewage, 279 



in Soil, 333 

 Nitrogen, addition to soil, 303, 314 



Nitrogen cycle, 185 



Nitrogen filiation (atmospheric), 303, 



339 

 aerobic species, 340 

 anaerobic species, 340 

 biological relations, 339 

 chemical relations, 339 

 cultures for inoculation, 352 

 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 



Nitromonas, 146, 329 



Nitrosomonas, 146, 281, 329 



Non-symbiotic nitrogen fixation, 339 

 aerobic species, 340 

 anaerobic species, 340 

 energy relations, 342 

 history of, 339 



Normal precipitins, 718 



Nosema bombycis, 656 



Notonecta glauca, 644 



Noxious retention theory of immunity 

 721 



Nuclease, 194 



Nuclein, 16 



Nucleolus, 16 



Nucleoplasm, 15 



Nucleus, 15, I22 

 bacteria, 87, 91 

 bi-, 131 , 

 diffuse, 17, 91 

 division, 28 

 fluid, IS 

 forms, 17 

 molds, 42 

 protozoa, 122 



