INDEX 



%^ 



Bacteria, influence of heat upon, 



200, 201, 202 



Bacteria, influence of light on, 66 



Bacteria, influence of . osmotic 

 pressure on, 67 



Bacteria, influence of poisons in 

 soil, 202-209 



Bacteria, influence of poisons on, 

 69 



Bacteria, influence of pressure on, 

 68 



Bacteria, influence of shaking on, 

 67 



Bacteria, influence of tempera- 

 ture on, 62 



Bacteria, longevity of, 33 



Bacteria, movement of, 2, 28-30 



Bacteria, nitrogen requirements, 



Bacteria, number of in soil, 92 

 Bacteria, occurrence of, 14-17 

 Bacteria, oxygen requirements, 59 

 Bacteria, parasitic, 56 

 Bacteria, reproduction of, 25-27 

 Bacteria, role in nature, 12-22 

 Bacteria, saprophytic, 56 

 Bacteria, shape of, 23 

 Bacteria, size of, 27, 28 

 Bacteria, stimulation by alkali, 



192 

 Bacteria, variation in shape, 24 

 Bacteria,, vitamin requirements of, 



59 



Bacteria, water requirements of, 



56 _ 



Bacteria, weight of, 27, 28 

 Bacterial composition, 46 

 Bacteriology, history of , l-ii 



Bacteriods, 158 

 Boussingault, 10, 120 

 Beans, how inoculated, i68 

 Beijernick, 10, 141, 158 

 Biological, agencies in soil forma- 

 tion, 91 

 Botulinus, toxin, 48 

 Bryophytes, 14 

 Buonanni, 3 



c 



Calcium carbonate, influence on 



nitrogen fixation, 142, 143 

 Calcium carbonate of soil, 80 

 Calcium carbonate, requirements 



of plants, 88 

 Capitate, 33 

 Capsule, 31 

 Carbon, assimilated by nitrifiers, 



126 

 Carbon bisulfid, influence on soil, 



202, 203 

 Carbon cycle, 98 

 Carbon dioxid, in atmosphere, 98, 



99 

 Carbon dioxid, sources of to 



plants, 156 



Carbon, in man, 98 



Carbon, nitrogen ratio, 1 1 1 



Carbon, requirements of bacteria, 



57 



Carbohydrates, influence on bac- 

 teria, 149 



Cardan, 3 



Caron, 141, 148 



Cell, composition of, 46 



Cell, structure, 30, 31 



Cellulose, description of 

 183 



I o2, 



