SUBJECT INDEX 



431 



Crop, influence of, on bacterial flora, 



250 



on nitrates of soil, 236 

 on nitrification, 230, 231 

 on nitrogen fixation, 282, 283 

 production, essential elements in, 319 

 rotation, 319-326 

 Cycle, biological, in sewage, 363 

 of carbon, 182, 183 

 of elements, 181-187 

 of nitrogen, 183, 184 

 of phosphorus, 184, 187 

 of sulphur, 184 

 Cytoplasm, composition of, 61 



DECAY, 188-193 

 definition of, 188 

 products of, 190, 191 

 Denitrification, 239-247 

 by actinomyces, 170 

 early theories on, 239, 240 

 enzymes concerned with, 81 

 influence of media reaction on, 241, 



242 



of temperature on, 245 

 . of water on, 244, 245 

 losses of nitrogen in, 245, 246, 247 

 organisms concerned in, 240, 241 

 reactions of, 92 

 Denitrifiers, food requirements of, 242, 



243 



function of, 247 

 metabolism of, 243, 244 

 Deodorants, 110 

 Desiccation, influence on Azotobacter, 



276 



Diplococci, 37 x 

 Disease due to meat, 397 

 to milk, 378 

 to water, 351, 352 

 milk-borne, character of, 379, 380 



extent of, 380-383 



Disinfectant, chlorinated lime as, 1 15 

 definition of, 110 

 formaldehyd as, 116 

 hydrocyanic acid as, 1 17 

 mercuric chlorid as, 117 

 sulphur dioxid as, 116 

 Disinfectants, chlorin compounds as, 



114 



classes of, 111 

 emulsions as, 113, 114 

 influence of medium on, 113 

 of moisture on, 111 

 of temperature on, 111 

 laws governing action of, 111 

 mode of action, 111 

 Drying, preservation of food by, 406 

 Dysentery due to water, 353 



E 



ECTOPLASM, 42 



composition of, 61 

 Eggs, bacteria in, 392, 393 

 Electricity, germicidal influence of, on 



bacteria, 104 

 influence of, on bacteria, 103 



on medium, 104 

 Emulsion, 80 



Energy, liberation by enzymes, 80 

 sources of, 64 



for Azotobacter, 261-266 

 for denitrifiers, 243 

 for nitrifiers, 223 

 Ps. radicicola, 312 

 Ensilage, 413, 414 

 Enzymes, 71-81 



action of, on phosphates, 175 



classification of, 79 



concerned in ammonification, 204, 



206 



in cellulose fermentation, 330 

 in denitrification, 243 

 in nitrification, 224 

 in Ps. radicicola metabolism, 305 

 definition of, 72, 73 

 factors governing action of, 76-79 

 hydrolytic, 79 

 influence of poisons on, 79 

 of temperature on, 77, 79 

 of time on, 78 

 oxidizing, 81 

 properties of, 76 

 reversible action of, 78 

 specificity of, 77 

 terminology of, 75, 76 

 Epidemiologist's method of working, 



355-358 

 Extractives in bacteria, 58, 59 



F 



FALLOW, influence of, on nitrification, 

 231-235 



loss of nitrates from, 231 

 Fats, action of bacteria on, 87 

 Fermentation, 188-193 



of alcohol, 83, 84 



alcoholic, 411 



definition of, 188 



early theories of, 21, 71, 72 



enzymes of, 79 

 Ferments, extracellular, 72 



intracellular, 72 



organized, 72 



unorganized, 72 

 Fertilizers, influence of, on legumes, 



313, 314 

 Food, bacteria in-, 387-394 



function of, for bacteria, 64 



milk as, 368-370 



preservation of, 404-410 



