1030 



INDEX 



Porthetria dispar, 909, 910, 935, 947 

 Potassium in soil, 424 

 Potato, blackleg of, 980 



wilt of, 990 

 Potential, 159 



Poultry, refrigeration of, 544 

 Powdered milk, 507 

 Precipitate, 718, 720 

 Precipitin, 718 



anti-, 719 



auto-, 719 



co-, 720 



forensic use of, 720 



formation of, 718 



iso-, 719 



normal, 697, 718 



specific inhibition, 719 

 Precipitinogen, 718, 720 

 Precipitoid, 719, 720 

 Predisposition to disease, 685 

 Preservation of food by chemicals, 550 

 legal control of, 558 



by cold, 542 



by drying, 516 



by heat, 524 



by -pasteurization, 530 



of vegetables by fermentation, 570 

 Preservatives, 288 



acetic food, 556 



alcohol, 557 



benzoic acid, 556 



boric acid, 555 



effect on food, 554 



formaldehyde, 557 



formic acid, 556 



inorganic, 555 



in milk, 460 



nitric acid, 555 



nitrous acid, 555 



organic, 556 



ozone, 325 



salicylic acid, 556 



sodium chloride, 554 



sugar, 554 



sulphurous acid, 555 



wood smoke, 557 



Pressure, influence of, 283 

 Proagglutinoids, 717 

 Processing of canned foods, 532 

 Prodigiosin bodies, 247 

 Production of heat, 250 



of light, 251 



Prohibition and wine, 621 

 Promitosis, of protozoa, 130 

 Properties of enzymes, 205 

 Prophase, 28 



Propionic bacteria, in wine, 610 

 Prorodon teres, 26 

 Protease, 208, 211 

 Protection against disease, 688 



conjunctiva, 692 



cutaneous orifices, 688 



exposed mucous membranes, 689 



geni to-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, 688 



stomach, 691 



subcutaneous tissue, 689 

 Protein bodies, 240 



in soil, 380 

 Protein, in cells, 188 



determination of degradation, 240 



enzymes of, 208, 211 



foods, drying of, 523 



products of degradation, 239 



as reserve product, 22 



in sewage, 332 



toxic bacterial, 676 

 Proteolysis in cheese, 494 

 Proteolytic enzymes, 208, 211 



determination of, 212 



of yeasts, 215 



