GENERAL INDEX 



347 



Physical properties of soil, 2-4 

 Physiologist, field for, 267-268 

 Physiology of bacteria, effect of anti- 

 biotic agents, 215-219 

 Pigment formation and antagonism, 50- 



51 



Pigments, 53, 102-103, 160, 161-165 

 Plants 



agents pathogenic to, 18, 246-247 

 bactericidal action of juice, 188 

 diseases of, control, 246-258 

 by actinomycetes, i 21-122 

 by antibiotic substances, 141 

 by fungi, 138 



by use of antagonistic microorgan- 

 isms, 1 21-122, 138, 248-249 

 methods, 250-256 

 of fungal diseases, 256-258 

 influence on microbial population of 

 soil, 7-8 

 Plate culture method of determining 

 abundance of microorganisms in 

 soil, 7 

 Pneumonia organism, survival, 30 

 Poliomyelitis, 153-154 

 Polypeptides, 53, 160, 1 67-1 71 

 Polysaccharidases, 165-167, 243 

 Potato scab, i 21-122, 253 

 Proactinomycin, 175, 270 



chemical nature, 53, 159, 160, 161, 



171 



compared with actinomycin, i 20 



effect on bacteria, 120, 161 



toxicity, 158 

 Prodigiosin, 53, 160 

 Production of antibiotic substances, 

 methods of growing organisms for, 

 64-66 

 Protamine, 217 

 Protozoa 



in manure and urine, 23 



in soil, 6, 9 



relation to bacteria, 23, 143-146 



relation to fungi, 146 

 Protozoan theory of soil fertility, 144 

 Pseudomonas aeruginosa, antibacterial 



substances of, 1 61-163 

 Puberulic acid, 159, 185, 270 

 Pure cultures, i 3 

 Pyocyanase, 67, 91-92, 162, 270 



Pyocyanase {cont.) 



antiluminescent activity, 77 



chemical nature, 53, 159, 160, 163 



effect on bacteria, 77, 190, 195 

 by species, 70, 209 



practical value, 163, 221-222, 226 



toxicity, 245 

 Pyocyaneus organism as antagonist, 89 

 Pyocyanic acid, 162 

 Pyocyanin, 67, 92-93, 270 



antiluminescent activity, 77 



chemical nature, 53, 159, 160, 163 



effect on bacteria, 77, 190, 195 

 by species, 70 



effect on fungi, 141 



inhibitory action, 21 1 



isolation, 162 



structural formula, 164 



toxicity, 245 

 Pyoxanthose, 162 

 Pyrogenic substances, 178, 179, 228 



Quinones, 53, 102, 103, 161, 173 

 classification, 182 

 effect on bacteria, 195, 207, 211 

 neutralization of iodinin, 198 



Radiations, 53 



Rectal cancer and £■. coli, 97 



Repressive antagonism, 49 



Rhizosphere, 5 



Rickettsiae, murine typhus, 232 



Root parasites. Fig. 2 (p. 42), 247, 248, 



249 

 Rust spores, inhibition of, 1 40-1 41 



Saliva, antibacterial properties of, 27 



Saprophytic organisms in soil, 15-18 



Saprophytism, 40 



Sarcoma cells, 155 



Sea water, bactericidal action of, 34 



Seed inoculation, 256 



Selective culture method of determin- 

 ing abundance of microorganisms 

 in soil, 7 



Semisolid media for testing antagonistic 

 action, 64 



