874 



INDEX OF SUBJECTS 



Campascus, 332 



Canada field pea, nodule bacteria of, 



136 

 Canthocamptus, 355 

 Carabidae, 356, 361 



Carbohydrates, decomposition of, by 

 microorganisms, 409, 564, 678 

 influence of, on protein decomposi- 

 tion, 511 

 utilization of, by nitrogen-fixing 

 bacteria, 561 

 Carbon bisulfide, influence of, on bi- 

 ological activities in soil, 749, 754, 

 762 

 Carbon dioxide, content of soil at- 

 mosphere, 640, 682 

 evolution, 376, 445, 515, 621, 681-685, 



688-689, 701, 720, 721 

 and energy utilization, 425, 566 

 as an index of biological activities 

 in soil, 717-725 

 Carbon monoxide as a source of energy 



for bacteria, 59, 98, 407 

 Carbon-nitrogen ratio, in medium, as 

 affected by different groups of 

 organisms, 513 

 in soil, 509, 510,702-707 

 of organic matter, 514, 687, 704, 770 

 Carbon, oxidation of, by bacteria, 98 

 sources for bacteria, 368 

 transformation by microorganisms, 



504 

 utilization of, by actinomyces, 296 

 utilization of, by fungi, 242 

 Carboxydomonas oligocarbophila, 98 

 Cardinal points for growth and spore 

 formation of obligate anaerobic 

 bacteria, 162 

 Carotin in algae, 215 

 Carrots as reducing agents, 171 

 Carychium, 359 



Cassia, nodule bacteria of, 135, 136 

 Casuarina, nodule formation by, 139 

 Catalase formation by anaerobic bac- 

 teria, 163 

 Catalytic action of soil, 734-736 

 Ceanothus, nodule formation by, 105, 

 138, 139 



Cellulase, 435, 436 



Cellulose agar medium, 197, 297 



Cellulose as a source of energy, 297, 448 



for nitrogen-fixing bacteria, 447 

 Celluloses, chemistry of, 427-432 

 Cellulose decomposing bacteria, 27, 

 38, 60, 154, 175, 190, 448 

 decomposing capacity of soil, 725 

 decomposition and CO2 evolution, 



725 

 decomposition and nitrogen assimi- 

 lation, 727 

 decomposition by aerobic bacteria, 



195-200, 434, 439 

 decomposition by anaerobic bacteria, 



166,173,190-195,432,437 

 decomposition by denitrifying bac- 

 teria, 188, 200-201, 441 

 decomposition by herbivorous ani- 

 mals, 434 

 decomposition by thermophilic bac- 

 teria, 173, 201-203, 435-436, 439- 

 441,445 

 decomposition by actinomyces, 441 

 decomposition by fungi, 242, 263, 



443-444 

 decomposition by protozoa and other 

 invertebrate animals in manure, 

 444 

 decomposition in soil, importance of, 



446, 683 

 decomposition, influence of soil con- 

 ditions on, 448 

 Cellulose, determination of, 431 

 influence of on soil microorganisms, 



769 

 preparation of, 197 

 Centricae, 227 

 Centropyxis, 332 

 Cephalobus, 347, 350 

 Cephalosporium, 253, 258, 277, 808 

 Cephalolhamnion, 334 

 Cephalolhecium roseum, 244, 490, 779 

 Cercobodo, 333 

 Cercomonas, 330, 333, 337 

 Cercospora per sonata, 808 

 Cerotoma, 362 

 Chaetocladiaceae, 249 



