SUBJECT INDEX 



1187 



Photosynthetic organisms, 281 

 Physiology in classification, 126 

 Phytobacteriology, 590 

 Phytophthora infestans, 590 

 Pickling, 440 

 Picric acid, 19, 20 

 Pigment 



red bacteria, 327, 328 



as generic distinction, 133 

 Plague, 2 



anti-, serum, 927 



of fowls, 518 



virulence variations, 566 

 Plant. See also Cross-inoculation groups. Root 

 nodules 



food mobilization, 348 



oxidation and reduction reactions, 208 

 Plant Diseases, Bacteria in, 590-606 



control of, 606 



bacterial plant pathogens 

 agglutination, 599, 600 

 classification, 593 

 colony variation, 595 

 difTerentiation, 594 

 dissemination by insects, 605 

 distribution, 592 

 entry, route of, 603 

 immunology, 601 

 tissue invasion, 603 



host relations, 332, 570 



insect dissemination, 605 



mosaic, 518 

 Plaques, 525 

 Plasma cells, 652 

 Plasmodium falciparum, 696 

 P. malariae, 696 

 P. praecox, 695 

 P. vivax, 696 

 Plasmolysis, ;2, 543 

 Plasmoptysis, 2 

 Plasteins, 704 

 Plaster of Paris, 558, 559 

 Pleomorphism, 2, 44 

 Pleuropneumonia, 518 

 Pneumococci, 8, 62, in 



anaerobic extracts of, 216 



chances of collision, 868 



electrical forces, 866 



infections in 

 guinea pigs, 616 

 mice, 635, II 22 



nucleoprotein, 702 



peroxide production, 216 



potential, 799 



anti-, sera, 928, 929, 958 



specific soluble substance, 726 



and stickiness of cells, 867 



rough and smooth strains, 570 



mutations to streptococci, 577 



type specificity, 731 



virulence, charge and phagocytosis, 863 



virulence for mice, 569 



Pneumonia 



chemotherapy, 1123, 1130 



influenza, 942 



ferments from lung, 876 



treatment by ethylhydrocuprein, 11 22 

 Poisoning. See Food 

 Poisons, anaphylactic, 982 

 Polar groups, 162 



Poliomyelitis, 518, 582, 941, 942. See also Infan- 

 tile paralysis 



streptococcus antiserum, 932 



variations in virulence, 566 

 Pollen extracts, 963 

 Polluted water, 69, 365 

 Polysaccharides, 17, 834 



as antigens, 971 

 Populations, Bacterial, 58-83 



volume occupied by, 544 

 Potassium 



necessary to growth, 280 



in soil, 319 

 Potato blight, 590 



Potential difference. See also P.D. 



and agglutinability, 569 



for filters, 557 



effect of lanthanum nitrate, 572 



for microbes, 566 

 Potentials, 863 



effect of agglutinating sera, 798 



critical, of a suspension, 795 



electrode, 190 



Oxidation-Reduction, of Dye Systems, 

 188-97 



and pneumococcus, 799 



effect of salt solution on, 793 



of charged sphere, 169 



and stability, 170 



effect on valency, 799 



and virulence, 569 



zeta, 169 

 Precipitation 



of colloids, 790 



and complement fixation, 855 



reactions in syphilis, 849 



tests for syphUis, 849. See Kahn reaction 

 Precipitinogen, 824 



precipitin-, combination, 826, 827 



preparation, 829 



Precipitins, 824-29; 921, 1037, 1083 

 and anaphylaxis, 981 

 bacterial, 828 

 diagnosis by, 830 

 organ specificity, 826 

 -precipitinogen combination, 826, 827 

 production of, 828 

 properties of, 825 

 species identification by, 829 

 specificity, 826 

 test, 8 



Pregnancy, complement fixation test in, 847 



Preserving of foods, 440, 441 



Presumptive test for coli-aerogenes group, 364 



