884 



INDEX OF SUBJECTS 



Methods, of determination of ammonia 

 in soil, 497 

 of determination of numbers of 



microorganisms in the soil, 6 

 of isolation of anaerobic bacteria 



from soil, 164 

 of isolation of soil algae, 218 

 of studying actinomyces, 291 

 of studying animal population, 342 

 of studying cellulose decomposition, 



443 

 of studying soil microorganisms, 6 

 Metopus, 336 

 Mice in soil, 342 

 Micro-actinomyces, 309 

 Microaerophile bacteria, 160 

 Microbial activities in the soil, proof 



of, 5-6 

 Microbial cell, chemical composition 



of, 377 

 Microbiological condition of soil, meth- 

 ods of determination, 709 

 Micrococcus, 58, 118, 153, 208 

 cytophagus, 195 

 melanocyclus, 195 

 nitrosus, 73 

 ochraceus luteus, 762 

 paraffinae, 204 

 pyogenes, 182, 208, 209, 212 

 selenicus, 91 

 ureae, 208, 209, 212, 762 

 ureae liquefaciens, 208 

 Microcoleus, 220, 226 

 Microcystis, 226 

 Microgromia, 332 

 Micromonospora, 295 

 Microorganisms, and partial steriliza- 

 tion of soil, 763-766 

 role of, in humus formation, 693 

 Microscopic counts compared with 

 plate counts, 27 

 methods for study of soil bacteria, 



7-11 

 methods for study of soil fungi, 240 

 study of actinomyces, 291 

 Microsiphonales, 287 

 Microspira aestuarii, 189 

 agar-liquefaciens, 199 



Microspira desulfuricans, 188, 611, 612 

 Microspora, 228 



Milk, growth of actinomyces on, 298 

 Milnesium, 354 



Mineral composition, of microbial 

 cells, 3S0, 625 



of plants, 429 

 Mineral requirements, of algae, 231 



of Azotobacter, 571 



of fungi, 242, 260 

 Mineral transformation in soil, 614, 



644-668 

 Mineralization of organic matter, 522 

 Minerals, role of, in bacterial metab- 

 olism, 368, 667-668 

 Mites in soil, 342 

 Mixed and pure cultures in the study 



of soil organisms, 641 

 Modification of nitrate-forming bac- 

 teria by culture, 76 

 Modification of nodule bacteria, 134 

 Moisture, influence of, on bacterial 

 numbers in soil, 34 



influence of, on biological activities 

 in soil, 621-624, 781-784 



influence of, on nitrogen-fixation, 5S3 



influence of, on plant parasites, 812 

 Moisture film, 633 

 Molds (see Fungi) 

 Moles in soil, 342 

 Molluscs in soil, 342, 357, 359 

 Monas, 82, 334 

 Monilia, 3, 238, 252, 265, 779 



sitophila, 495 

 Moniliaceae, 267 

 Moniliopsis, 278 

 Monocilia, 228 

 Monohystera, 346, 347, 350 

 Mononchus, 346, 348, 349, 350, 818 

 Monosiga, 333 

 Monosaccharides, decomposition of, 



by microorganisms, 466 

 Monosporium, 254, 260, 265 

 Moraria, 355 



Morphological characters of bacteria, 57 

 Morphology, of anaerobic nitrogen 

 fixing bacteria, 108 



of Azotobacter, 117 



