876 



INDEX OF SUBJECTS 



Composition, chemical, of the micro- 

 bial cell, 377 

 of vegetable organic matter, 427 



Composts, of greensand and sulfur, 661 

 of sulfur and phosphate, 614 



Conductivity of soil, 633 



Condylosloma, 336 



Conidiophorae, 249 



Conifers, mycorrhiza formation by, 272 



Conjugatae, 229 



Control of plant diseases, 814 



Copepoda in soil, 342, 354 



Coprinus, 243 



Coriaria, nodules of, 105, 138 



Corn cobs and fodder, composition of, 

 428 



Corn root rot, temperature of control, 

 815 



Corticium vagum, 807, 813 



Cortinarius, 276, 278 



Corycia, 332 



Corynebacteria, 289 



Corythion, 332 



Coscinodiscus, 227 



Cothurnia, 336 



Cow clover, nodule bacteria of, 136 



Cowpea, nodule bacteria of, 136 



Craspedosoma, 355 



Creatinine in soil, 479 



Crenic acid, 697 



Crenothrix, 93 



Cresol, decomposition of, 205, 465 



Crimson clover, nodule bacteria of, 136 



Cropping of soil, influence of, on micro- 

 biological activities, 712, 800 



Cross-inoculation of nodule bacteria, 

 134 



Cruciferae, mycorrhiza formation by, 

 273 



Crude fibre, 429 



Crustacea in soil, 342, 354, 357 



Cryploglena, 334 



Cryptomonadaceae, 215 



Cryptomonadinae, 334 



Cryptomonas, 334 



Cultivation, of algae, 221 

 of soil, influence of, on biological 

 activities, 743, 784-787 



Cultivation, of soil, influence of, on 

 nitrogen-fixation, 585 

 of soil, influence of, on numbers of 

 microorganisms, 40 



Cultural methods for study of soil 

 bacteria, 11, 12 



Culture media for counting soil bac- 

 teria, 13-19 



Cunninghamella, 249, 444, 454 



Curculionidae, 361 



Cutins, 460 



Cutworms in soil, 362 



Cyanamide, decomposition of, by bac- 

 teria, 211, 487, 488 

 decomposition of, by fungi, 267 



Cyanophyceae, 3, 215, 220, 223, 224, 

 225, 226, 230, 645 



Cyanuric acid in soil, 479 



Cyatholaimus, 349 



Cyathomonas, 334 



Cycas, nodule formation by, 138, 139 



Cyclidium, 335 



Cyclotella, 227 



Cylindrocystis, 228 



Cylindroiulus, 355 



Cylindrospermum, 217, 227 



Cymbella, 227 



Cyperaceae, mycorrhiza formation by, 

 273 



Cystine, 600, 613, 614 



Cystococcus, 231 



Cysts of protozoa, 46-50, 316, 325 



Cytase, 454 



Cytosine in soil, 479, 671 



Czapek's solution, 243, 291 



D 



Dactylococcus, 228 



Dalea alopecuroides, nodule bacteria 



of, 137 

 Damping-off fungi in soil, 807 

 Deaminization, 473 

 Death of microorganisms, 372 

 Decarboxylation, 482 

 Decay, 477, 522 

 Decomposition, of manure, 496 

 of organic matter in soil, 500, 680 



