INDEX 



1027 



Non-symbiotic nitrogen fixation, history 



of, 401 



Nosema apis, 937, 942 

 morphology, 940 



bombycis, 899 



morphology of, 938 

 in pebrine, 937 



disease of bees, 939 



pulicis, 946 



Notonecta glauca, 919 

 Noxious retention theory of immunity, 



721 



Nuclein, 16 

 Nucleolus, 1 6 

 Nucleoplasm, 15 

 Nucleus, of bacteria, 89 



diffuse, 17, 93 



division of, 28 



forms, 17 



of molds, 42 



of protozoa, 125 



reproductive, 18 



structure of, 15 



value of, 1 6 



vegetative, 18 

 Number of bacteria, in air, 306 



in butter, 476 



in concentrated milk, 506 



in cream, 476 



in frozen milk, 274 



in ice cream, 513 



in infection, 674 



in milk, 429 



in soil, 367 



in water, 316 



Nutrition of microorganisms, 195 

 Nutrition, energy requirements, 199 



of protozoa, 197 



OATS, blade blight of, 956 

 Obligate aerobes, 228 



anaerobes, 228 



parasites, 132, 660 



saprophytes, 660 

 Odors in milk, 428 

 (Edema, malignant, 839 



Oidium albicans, in mouth, 593 

 in thrush, 776 



lactis, 58, 238, 272, 463 

 in butter, 482 

 in cheese, 503 

 effect of pressure on, 283 

 symbiosis of, 298 

 Oleomargarine, cultures for, 482 

 Olive canning, 573 



knot, 969 



pickling, 572 

 Oomycetes, 38 

 Oospore, 38 



Ophidomonas jenensis, 105 

 Opsonic index, 712 

 Opsonins, 711 



autohemo-, 714 



hemo-, 714 



isohemo-, 714 

 Opsonogens, 712 

 Optimum temperature, 269 

 Orchids, brown rot of, 982 

 Organellae, 126 

 Organic acids, as food, 223, 226 



in soil, 379 



Organic food preservatives, 556 

 Organic matter, mineralization of, 351 



in soil, 358, 375 

 Origin of soil, 41 7 

 Ornothodoras moubata, 901 

 Oroya fever, 897 

 Osmosis, 174 



osmotic pressure, 174, 176, 263 

 Osteomyelitis, 792 

 Outlines of plant groups, 13 



of protozoal groups, 13 

 Oxidase, 208, 216 

 Oxidation of acetic acid, 238 



of acids, 238 



of alcohol, 238 

 of ammonia, 201 



of carbohydrates, 234 



of carbon monoxide, 377 

 in soil, 351, 373 



of cellulose, 362 



of hydrogen, 351, 377 



