INDEX OF SUBJECTS 



891 



Pseudomonas, 58 

 caudalus (see Bad. caudatum) 

 fluorescens (see Bad. fluorescens) 

 radicicola (see Bad. radicicola) 



Pseudomycorrhiza, 278 



Psilocybe, 257 



Psychrophilic bacteria, 775 



Pulmonata, 357 



Punctiform bacteria in soil, 151, 153 



Pure culture study, 53, 641 



Purification of anaerobic bacteria, 165 



Purple bacteria, 79, 83 



Putrefaction, 175, 477 



Pyrenomycetes, 275 



Pyrenomycetineae, 251 



Pyrocatechin, action of, on bacteria, 

 165, 167 

 oxidation of, by bacteria, 205 



Pyrogallic acid, use of, in the isolation 

 of anaerobic bacteria, 170 



Pyruvic acid, 414, 439, 469, 574, 681 



Pythiacystis, 808 



Pythium, 238, 247, 807, 813, 815, 816 



Quadrula, 332 



Q 



R 



Radiation, influence of, on actino- 



myces, 299 

 Radiobacter group of bacteria, 59, 



106,112,212,582 

 Raisin agar, 18 

 Raphidiophrys, 331 

 Raphidium, 228 



Ray fungi, 288 (see Actinomyces) 

 Reaction, influence of, on actinomyces, 

 301, 636, 637 

 influence of, on anaerobic nitrogen- 

 fixing bacteria, 111, 637 

 influence of, on denitrification, 551 

 influence of, on growth of anaerobic 



bacteria, 176 

 influence of, on growth of fungi, 244, 



262, 637 

 influence of, on hydrogen bacteria, 

 102, 637 , 



Reaction, influence of, on nitrate 

 formation, 528, 637 

 influence of, on nitrate-reducing 



bacteria, 186 

 influence of, on nitrogen-fixation, 



581, 595 

 influence of, on nodule bacteria, 



133, 637 

 influence of, on plant pathogenic 



fungi, 813 

 influence of, on potato scab, 809 

 influence of, on protozoa, 314, 637 

 limiting and optimum for growth of 



Azotobader, 582, 637, 792 

 limiting and optimum for growth of 

 Bad. radicicola, 594, 636, 637 

 limiting and optimum for growth of 

 nitrifying bacteria, 66, 77, 637 

 limiting and optimum for growth of 

 sulfur-oxidizing bacteria, 90, 91, 

 400, 637 

 Reaction, of media, 118 

 of soil, 633-638 



of soil, as influenced by cellulose 

 decomposition, 451 

 Reaction velocity, 372 

 Red clover, nodule bacteria of, 136 

 Reducing power of soil, 736 

 Reductase, 521 



Reduction of nitrates to atmospheric 

 nitrogen, 183 

 of nitrates to ammonia, 182 

 of nitrates to nitrites, 180 

 of sulfates by bacteria, 556, 610 

 Reduction processes in soil, 522, 



542-557 

 Reductive deaminization, 483 

 Resin acids and esters in soil, 671 

 Respiration and nitrogen-fixation, 566 

 coefficient, 417 

 equivalent, 417 

 of nitrate-forming bacteria, 392 

 Rhabditis, 347, 349, 350 

 Rhabdolaimus, 350 

 Rhadocoelae, 345 



Rhizobium, numbers of, in soil, 37, 39 

 leguminosarum, 126, 825 (see Bad. 

 radicicola) 



