890 



INDEX 



Powdered milk, 441, 456 

 Precipitate, 718, 720 

 Precipitinogen, 718, 719 ' 

 Precipitins, anti-, 719 



auto-, 718, 719 



CO-, 720 



forensic use, 720 



iso-, 718 ' 



mechanism of, 718 



normal, 718 



specific inhibition, 719 

 Precipitoid, 720 

 Predisposition to disease, 685 

 Preservation by chemicals, 479 



by cold, 471 



by drying, 450 



by heat, 457 

 Preservatives, alcohol, 486 



benzoic acid, 486 



boric acid, 484 



effect on system, 483 



formaldehyde, 238, 486 

 ^ formic acid, 485 



hydrogen peroxide, 239 



inorganic, 484 



in milk, 385 



nitric acid, 481, 484 



nitrous acid, 481, 484 



organic, 485 



ozone, 269 



preserving by chemical action, 



483 

 by physical action, 483 



salicylic acid, 485 



sodium chloride, 483 



sugar, 480 



sitlphurous acid, 484 



vinegar, 486 



wood smoke, 486 

 Pressure, influence of, 227 

 Prodigiosin bodies, 177 

 Promitosis, 32, 127 

 Prophase, 28 

 Propionic bacteria, 512 

 Prorodon teres, 26 

 Proteases, 194, 197 



I^rotection against disease, 688 

 conjunctiva, 692 

 cutaneous orifices, 688 

 genito-urinary tract, 692 

 inflammatory processes, 693 

 intestines, 691 ' 



lungs, 691 

 mouth, 690 

 nasal cavity, 690 

 natural antibacterial substances, 



695 

 natural antitoxins, 694 

 normal agglutinins, 696 

 hemolysins, 696 

 precipitins, 697 

 skin, 669 



stomach, 691 ' 



Proteins, bacterial, 676 

 in fermentation, 276 

 as food, 151, 169 

 in sewage, 276 

 in soil, 320 

 toxic, 178, 676 

 Proteolytic bacteria, 169, 197, 276, 

 320 

 changes in milk, 385 

 in sewage, 276 

 in soil, 320 

 Proteosoma, 136, 834 

 Proteus group, 256 

 Protista, 43, 99, 120 

 Prototoxoids, 704 

 Prototrophic orgamsqis, 151 

 Protozoa, classification, 130 

 functions, 143 

 locomotion, 124 

 flageUa, 124 

 myonemes, 124 

 metabolism, 124, 146 

 reproduction, 125 

 anisogamous, 128 

 binary division, 125 

 chromosomes, 127 

 conjugation, 128 

 copula, 128 

 copulation, 128 



