INDEX OF SUBJECTS 



883 



Mallomonas, 334 



Manganese, as a source of energy, 59 

 salts, oxidation of, 93 

 stimulating action of, 665 

 transformation of, in soil, 665 

 Mannite decomposing capacity of 

 soil, 729 

 medium, 112, 113 

 Manure, as a carrier of bacteria, 

 772-773 

 cellulose decomposing bacteria in, 



434 

 composting of, 675 

 decomposition of, 444, 682 

 fertilizing action of, 773 

 influence of, on biological activities 



in soil, 771 

 influence of, on cellulose decompo- 

 sition, 727, 728 

 influence of, on numbers of actino- 



myces in soil, 41 

 nitrogen transformation in the rot- 

 ting of, 498, 686 

 numbers of bacteria in, 29-31 

 Marmots, in soil, 342 

 Marsh soils, occurrence of algae in, 224 

 Mastigamoeba, 333 

 Masligella, 333 

 Mastigophora, 312, 313, 333 

 Mathematical interpretation of results 

 of plate counts of numbers of 

 microorganisms, 24-27 

 Meat extract-peptone agar, 14 

 Media, for counting bacteria, 13-16 

 for counting fungi, 19 

 for cultivation of soil actinomyces, 



291, 306 

 for cultivation of soil algae, 221 

 for cultivation of soil fungi, 241-243 

 for cultivation of soil protozoa, 317 

 for differentiation of actinomyces, 



306 

 for isolation of algae, 218 

 for isolation of cellulose decomposing 



bacteria, 191, 195, 196, 198 

 for isolation of denitrifying bacteria, 



185 

 for isolation of iron bacteria, 95 



Media, for isolation of mycorrhiza 

 fungi, 279 

 for isolation of nitrate-forming bac- 

 teria, 74-75 

 for isolation of nitrite-forming bac- 

 teria, 64-72 

 for isolation of nitrogen-fixing bac- 

 teria, 107, 112 

 for isolation of nodule bacteria, 127 

 for isolation of urea bacteria, 207 

 for isolation of uric acid bacteria, 213 

 for isolation of sulfur oxidizing bac- 

 teria, 84-90 

 Medicago, nodule bacteria of, 130, 134, 



135, 136 

 Melanconiales, 257 

 Melanin, 698 

 Melanconium, 257 

 Melanospora, 763, 808 

 Melilotus, nodule bacteria of, 130, 135, 



136 

 Melolontha, 356 

 Melosira, 227 

 Menoidium, 334 

 Mercaptans, formation of, by bacteria, 



178, 614 

 Mermitbidae, 350 

 Merulius, 243, 257, 460 

 Mesophilic bacteria, 775 

 Mesotaenium, 229 

 Metabolism as a whole, 367 

 Metals, heavy, influence of, on nitrate 



formation, 534 

 Melapides, 336 



Methane bacteria, 59, 96-98, 406 

 Methane formation, by bacteria, 177, 

 437 

 by cellulose decomposing bacteria, 



193 

 in the decomposition of manure, 445 

 Methanomonas methanica, 96, 100, 406 

 Methods, of counting protozoa in the 

 soil, 45 

 of cultivation of soil fungi, 241 

 of demonstration of mycorrhiza 



formation, 279 

 of demonstration of occurrence and 

 abundance of fungi in the soil, 239 



