SUBJECT INDEX 



429 



Bacteria, Brownian movement of, 40, 



41 



in butter, 387 

 in canned foods, 394 

 capsules of, 43 

 carbohydrates in, 58 

 carbon requirements of, 68 

 cellulose in, 42 

 changes produced in milk by, 375, 



376 



in cheese, 289, 390 

 chitin in, 43 

 classes of, in milk, 376 



in water, 34."), :i lit 

 classification of, 46-57 

 composition of., 58-62 

 cytoplasm of, 43 

 definition of, 29 

 discovery of, 17 

 in eggs, 393 

 in ensilage, 413 

 energy for, 65 

 extractives in, 58 

 factors influencing number and kind 



in soil, 162, 164, 337, 338 

 food requirements of, 63-70 

 gradation of, 38 

 hemicellulose in, 42 

 hydrolyzing in sewage, 362 

 hydrogen requirements of, 68 

 ' in ice cream, 390, 391 

 indol, production by, 89 

 influence of antiseptics on, 129-138 



of calcium carbonate on, 139 

 chloride on, 142 



of chemicals on, 108-117 



of cold on, 100 



of electricity on, 103 



of gypsum on, 142 



of heat on, 95 



of iron sulphate on, 142 



of light on, 95, 101, 105 



of lime on, 141 



of magnesium salt on, 143 



of manganese salts o'n, 143, 144 



of manure in soil, 151, 153, 154 



of moist heat on, 99 



of moisture in soil on, 154, 155 



of osmotic pressure on, 106 



of oxygen on, 105 



of potassium salts in soil on, 144, 

 145 



of radium rays on, 103 



of Rontgen rays on, 103 



of salts' on, 139 



of shaking on, 107 



of sodium salts in soil on, 145 



of temperature and light on, 95-102 

 involution forms, 38 

 as liberators of phosphorus, 174 

 longevity of, 45 

 in lungs, 32 

 in meat, 393 



Bacteria, metachromatic granules, 4)5 

 method of determining number of, 



160 

 in milk, 31, 372, 373 



certified, 371 



common, 372 



condensed, 391, 392 



sources of, 372, 373 



speed of growth in, 374, 375 

 moisture in, 65 



content of, 58 

 morphology of, 37-45 

 motility of, 17, 42 

 nitrogen requirements of, 69 

 occurrence of, 31 

 oxygen requirements .of, 69 

 phosphorus requirements of, 69 

 pigment production of, 93 

 in plants, 32 

 pleomorphism of, 38 

 potassium requirements of, 69 

 production of heat by, 94 



light by, 94 



ptomains produced by, 91 

 role in nature, 32 

 in sewage, 361 



oxidizing in, 363 



pathogens in, 364, 365, 366 



reducing in, 363 

 sheath of, 43 

 skatol formation by, 89 

 soil formers, 33, 171, 172 

 in soils, kinds of, 164, 165 



number of, 161, 162 

 spores of, 44 

 stimulation by salts, 147 

 in stomach, 32 

 sulphur requirements of, 69 

 toxicity of salts for, 149 

 vital movement of, 41 

 vitamine requirements of, 70 

 in water, 342 



classes of, 345, 346 



influence of light on, 343 



of sedimentation on, 343 



of temperature on, 344 

 weight of, 39 

 zooglcea, 43 

 Bacterial activities, influence of 



arsenic on, 118-126 

 of enzymes on, 7 1-8 1 

 of manure on, 150-159 

 of salts on, 139-149 

 counts, value of, 161 

 metabolism, 71-94 



products of, 81-94 

 toxins, 91 



Bacteriology, agricultural, 27, 36 

 dairy, 36 

 definition of, 29 

 development of, 17-2S 

 industrial, 36 

 pathological, 36 



