SUBJECT INDEX 



435 



Pigment, production of, by actino- 



mycetes, 169, 170 

 by Azotobacter, 94, 270, 271 

 Pigments, classes of, 93 



production of, 93 

 Plants, classes of, 30, 31 

 elements in, 181 

 poisonous, 395, 396 

 Plasmolysis, 67 

 Pleomorphism, 38 

 Pneumococcus, 37 

 Poison, metallic, 396, 397 

 Poisoning, 395-403 

 classes of, 395 

 food causing, 398 

 from diseased meat, 397, 398 

 from ensilage, 414 

 prevention of,'402, 403 

 ptomain, 400 

 symptoms, 397, 398 

 Poisonous foods, 395, 396 

 Polar bodies, 43 

 Potassium carbonate, influence of, on 



nitrification, 218, 219 

 liberation of, by bacteria, 180 

 requirements of Azotobacter, 257 



of bacteria, 69 

 salts, influence of, on bacteria, 144, 



145 



in Utah soils, 320 

 Preservative, definition of, 110 

 Pressure on bacteria, 106, 107 

 for preserving food, 107 

 preservation of food by, 406, 407 

 Proteases, 80 



Protein, action of bacteria on, 88 

 hydrolysis, 204, 205 

 liquefaction in sewage, 362 

 as source of carbon, 68 

 Protista, 29 



Protozoa, action of antiseptic on, 131 

 of arsenic on, 121 

 of heat on, 131 

 Protozoan theory, 135 

 Pseudomonas fluorescens, 168 

 ammonia-producing, 196 

 morphology of, 168 

 physiology of, 168 

 in soils, 165 



nebulosa in sewage, 361 

 ochracea in sewage, 361 

 radicicola, 292 



bacteroids of, 303, 304 

 commercial cultures of, 318 

 cultural characteristics of, 297-299 

 entrance into host, 304 

 influence of acids on, 297 

 of aeration on, 312 

 of drying on, 299 

 of fertilizers, 313, 314 

 of moisture on, 312 

 of phosphorus in soil, 178 



Pseudomonas radicicola, influence of 



temperature on, 299, 313 

 metabolism of, 306-308 

 morphology of, 299-303 

 relationship to host, 305, 306 

 sources of energy for, 3 12 

 species, 292-299 

 staining of, 303 

 turcosa in sewage, 361 

 Psychrophelic bacteria, 96, 97 

 Pteridophytes, 30 

 Ptornain poisoning, 400 

 Ptomains, 90, 91, 189 

 Putrefaction, 188-193 

 definition of, 188 

 organisms concerned with, 190 

 products of, 190, 191 



RABIES, 26 



Radiobacter, 251 



Radium rays, action of, on bacteria, 103 



Rain, influences of, on soil nitrates, 236 



Rays, ultraviolet, as catalyzers, 225 



Reducing enzymes, 79, 81 



Reductase, 81 



Retting of flax, 414 



Rhizobium beijerinckii, 297 

 radicicola, 297 



Rontgen rays, influence of, on bac- 

 teria, 103 



Rotation and soil fertility, 325 



Rothamsted, 321, 322 



S 



SALT, influence of, on bacteria, 67 

 Salts, influence of, on bacteria, 139, 147 

 on bacterial activities of soil, 139- 

 149 



toxicity of, 145, 146, 149 

 Sarcina alba in sewage, 361 



aurantiaca, pigments of, 93 



lutea, pigment of, 93 



production of ammonia by, 196 

 in water, 346 

 Sauerkraut, 412 

 Schizases, 79 

 Schutz-Borissow law, 78 

 Season, influence of, on Azotobacter, 



281, 282 

 Sewage, bacteria in, 361, 362 



composition of, 360 



disposal of, 366, 367 



hydrolyzing bacteria in, 362, 363 



oxidizing bacteria in, 363 



pathogenic bacteria in, 364, 365, 366 



reducing bacteria in, 363, 364 

 Shaking, influence of, on bacteria, 107 

 Sheath, 43 



