254 



INDEX 



Forest humus, nature of, 82-83 

 Forest soils, inoculation of, 229-230 

 Formic acid, 171 



Fungi, activity of, in raw-humus soils, 

 82 

 assimilation of nitrogen by, in 

 decomposition of cellulose, 

 83-84, 95-96 

 decomposing cellulose, 82-85 

 decomposition of sugars by, 79-81 

 in soil, 23, 33-35, 59, 66-69 



influence of cellulose on number 



of, 83 

 influence of partial sterilization 



on, 227-228 

 influence of reaction on, 220 

 Fungi Imperfecti, 33 

 Fusarium, 34, 41 



G 



Gaseous phase of soil, 13 



Gases, formation of, in soil, 10, 13, 184 



Glucose, products of decomposition 



of, 80-81 

 Glutamic acid, decomposition of, 164 

 Growth of microbes, 245-246 

 Gums and slimes produced by micro- 

 organisms, 82, 86 



H 



Hardpans, 176 



Heat produced l)y microbes, 237 

 Hemicelluloses, decomposition of, 81- 

 82, 89, 91 

 occurrence of, in plants, 81 

 synthesis of, by microorganisms, 

 81-82 

 Hormodendrum, 34 

 Humus, forest, nature of, 82-83 

 formation of, in cellulose decom- 

 position, 87 

 soil, formation of, 99-101 

 Hydrocarbons, decomposition of, 90- 



91 

 Hydrogen from carbohydrate de- 

 composition, 80, 86 

 Hyphomycetes, 33 



Importance of microbes in soil, 21-23 



Infection of legumes by nitrogen- 

 fixing bacteria, 113-126 



Inoculation of soils, 126, 229-234 



Inorganic salts as sources of oxygen, 

 156 



Insects in soil, 39-40 



Intermediate products, formation of, 

 during decomposition, 75, 

 79-81 



Invertebrates in soil, 72 



Iron bacteria, 176-177 



Iron in soil, 18 



transformation of, by microbes, 

 176-178 



Isolation of microbes, 24 



Lactic acid, 163, 165, 166 

 Lecithin, decomposition of, 173 

 Legume bacteria, morphology of, 



115-117 

 Legume nodules, 118-119 

 Legumes, influence of, on soil ni- 

 trogen, 124 

 influence of nitrate on growth of, 



120-124 

 inoculation of soils for growth of, 



229-234 

 invasion of, by nodule bacteria, 



114-117 

 means of inoculation of, 231 

 nutrition of, 15 

 Leguminosae, bacteria of, 105, 113- 



126 

 Leptoihrix crassa, 177 

 Lignin, 77-78 



abundance of, in plants, 88 

 combination of, with cellulose, 82 

 decomposition of, 88-89, 91 

 in animal manure, 211-212 

 Ligno-cellulose of plant tissues, 78, 82 

 Lime in soil, 16, 18 

 Liming, influence of, on soil microbes, 

 217-221 

 I Liquid phase of soil, 12-13 



