INDEX OF SUBJECTS 



885 



Morphology, of Bad. radicicola, 130 



of nitrite-forming bacteria, 72 

 Mortierellaceae, 249 

 Mosaic virus in soil, 806 

 Moss protonema in soil, 215, 225 

 Mougeotia, 229 

 Mucedinaceae, 252, 289 

 Mucilages, 460 



Mucor, 3, 23S, 243, 244, 248, 258, 259, 

 278, 444, 459 



amylomyces, 379 



glomerula, 260, 637 



hiemalis, 495 



pusillus, 244 



ramannianus, 275 



stolonifer, 266 

 Mucoraceae, 247, 248, 249, 267 

 Mucorales, 239, 241, 243, 244, 247, 



260, 266, 268, 275 

 Mucorineae, 3, 246 



Mucuna utilis, nodule bacteria of, 136 

 Mycelial filaments in the soil, 239 

 Myceliphlhora, 252 



Mycelium of actinomyces, 287, 293 

 Mycelium radicis atrovirens, 278, 279 

 Mycetophilidae, 358 

 Mycobacteria, 59, 158, 204, 205, 286, 465 

 Mycobacterium album, 465 



lacticola, 97 



paraffinae, 465 



phlei, 97, 782 



rubiacearum, 140 



rubrum, 465 

 Mycoderma, 155 

 Mycocriny, 694 

 Mycodextrans, 460 

 Mycogalactans, 460 

 Mycogone, 255, 264, 265 

 Mycomycetes, 277, 278 

 Mycorrhiza formation, 270, 803 



fungi, 236, 270-284 



role of, in plant nutrition, 280 

 Myriapods in soil, 342, 355, 357, 361, 362 

 Myrica, nodule formation by, 105, 



138, 139 

 Myxobacteria, 59, 159 

 Myxomycetes, 236 

 Myxophyceae (see Cyanophyceae) 



N 



Ndegleria gruberi, 325, 330, 331 

 Naphthalene, decomposition of, 466 

 Nassula, 335 

 Navicula, 224, 227 

 Nebela, 332 



Nematodes, in soil, 3, 341, 345-351, 

 357, 358, 804 

 destruction of, in partial steriliza- 

 tion, 763 

 methods of determination, 343 

 temperature of control, 815 

 N ematogonium, 254 

 Nemathelminthes in soil, 341 

 Neocosmopora, 763 

 Nessler's reagent, 67 

 Nitrate "fermentation," 183, 185 

 formation as index of nitrogen 



availability, 539 

 formation as influenced by plant 



residues, 706 

 formation in soil and in solution, 536 

 -forming bacteria, 59, 62, 6S, 74, 151 

 -reducing bacteria, 174, 180 

 reduction in nature, 103, 552 

 reduction and cellulose decomposi- 

 tion, 200 

 Nitrates, assimilation of, 269, 544 

 as sources of oxygen, 420, 545 

 influence of, on cellulose decomposi- 

 tion, 728 

 influence of, on nitrate-forming bac- 

 teria, 394 

 influence of, on nitrogen fixation, 



133, 575 

 reduction of, and energy utilization, 



420, 546 

 reduction of, by actinomyces, 29S, 



302 

 reduction of, by Azotobacter, 576 

 reduction of, to ammonia, 182 

 reduction of, to atmospheric nitrogen 



183, 548 

 reduction of, to nitrites, ISO 

 source of, in soil, 523 

 transformation of, by microor- 

 ganisms, 543 



