INDEX 



233 



Feed, how bacteria, 53 

 Feeds, composition of, 210 

 Fermentation early work on, 6 

 Fertility, influence of bacteria on, 



200, 202 



Fertility, influence of legumes on, 



171-181 

 Fertilizers, influence on nitrogi^n 



fixation, 162 

 Flagella, 30 

 Food, function of, 54 

 Food, kinds of, for bacteria, 5 5 

 Food, quantity required, 54 

 Food, requirements of ammoni- 



fiers, 115 

 Food, requirements of bacteria, 



53-6i 

 Formaldehyde, as disinfectant, 69 

 Frank, 164 

 Fumigation, 69 

 Fungi, 14 



G 



Gelatin plate, first used, 7 

 Germicide, 69 

 Green manure, 217 

 Greenville soil, composition of, 



90 

 Growth, factors influencing, 62- 



70 

 Gunpowder, early use of, Ii8 



TT 



Heat, influence on bacteria, 65 

 Heat, influence on soil fertility, 



200-202 

 Heat, produced by bacteria, 5 1 

 Helmont, 3, 6, 156 



Hellriegel and Wilforth, 140, 



157, 162 

 Heterotrophic bacteria, 56 

 Hiltner and Stormer's Theory, 



203-205 

 Hopkins, 130 

 Humogen, 150 

 Humus, 108 



Humus, from various sources, 1 1 2 

 Hydrocyanic acid, 70 



Ice, in soil formation, 75 

 Inoculation of soil, 165-170 

 Involution forms of bacteria, 24, 



25 

 Iron, requirements of plants, 89 



Iron, in soil, 82 



K 



Kellerman and McBeth, 186 



Koch, 7 



Krainski, 152 



Kuhlmann and Dumas, 1 1 9 



Kuhne, 121 



L 



Lead, in soil, 206 



Leeuwenhoek, I 



Legumes, conditions favoring, 



160 

 Legumes, elements added by, 122, 



173 



Legumes, feed on nitrates, 177, 



178 

 Legumes, influence of non-le- 

 gumes on, 162, 163 



