336 



INDEX 



agents of, 204-206; definition of 

 process of, 205-206; lactic acid, 

 206-208 ; acetic acid, 208-209 ; 

 butyric acid, 209-210; methane and 

 mucilaginous, 211; of the higher 

 alcohols, aromatics, and fatty acids, 

 211-212; in the arts, in retting of 

 flax, preparation of indigo, curing of 

 hides and tobacco, bread-making, 

 etc., 214-215. 



Ferments, organized and unorganized, 

 204206. 



Filtration, sterilization by, 78; of 

 water, 301-302 ; of sewage, 302- 

 304- 



Fish, phosphorescence of, due to photo- 

 genic bacteria, 198-200. 



Fission, reproduction by, 42-43. 



Flagella on bacteria, 29 f . ; do not in- 

 terfere with process of fission, 45-46 ; 

 chemical structure of, 65; special 

 stain devised for, 98. 



Flame, sterilizing by a direct, 79. 



Fluid cultures, 92. 



Food of bacteria, 44-45, 67, 118; 

 classification according to, 128-129; 

 amount required, 128-129; of pho- 

 togenic bacteria, 199-200. 



Formaldehyde as a disinfectant, 148- 

 150. 



Fractional methods of isolation, 86. 



Freezing, all bacteria not killed by, 79. 

 See Temperature and Thermal death 

 point. 



Fungi, relationship of bacteria to, 120- 



Gases, produced from metabolism of 

 bacteria, 174; which may be pro- 

 duced by process of fermentation, 

 206. 



Gelatin culture medium, 73-74. 



Gelatin plate method, Koch's, 6, 89-91. 



Gelatin stab culture, 91-92. 



Genito-urinary tract, bacteria of the, 

 321-322. 



Germicidal action of some chemical 

 substances, 146 ff. 



Gonidia, 22, 51, 121, 187. 

 Gram's stain, 97. 



H 



Habitat, distribution of bacteria ac- 

 cording to, 282. 



Hanging drop preparations, 94. 



Haplobacteria, 15; form types of, 

 15-21; reproduction among, 42-50. 



Haplobacterina?, 105-109. 



Heat, value of, in destroying bacteria, 

 79, 134-137. See Temperature. 



Hematoxylin for staining, 95. 



Hemolysins, bacterial. 257-258. 



Higher bacteria (Trichobacteria), 21- 

 24; reproduction among the, 50-51. 



Histology of the bacterial cell, 52-60. 



Homothermic organisms, 138. 



Human body, bacteria of the, 319-332. 



Illusions, certain historical, due to bac- 

 teria, 196-197. 



Immunity, to pathogenic bacteria, 271- 

 273 ; theories of, 272-273. 



Indigo, bacterial enzymes of use in 

 preparing, 214. 



Indol, production of, by bacteria, 175- 

 176. 



Infections, factors influencing and 

 modifying, 267-270; effect of prop- 

 erty of virulence, 267-268 ; number 

 of bacteria necessary to produce an 

 infection, 268-269; avenue of in- 

 fection, 269; susceptibility of in- 

 dividuals to, 270; method of infec- 

 tion in case of plants, 278-280. 



Infectious diseases, 232-239. 



Intermittent filtration of sewage, 303. 



Intermittent method 'of sterilization, 

 80-81. 



Intestines, bacteria of the, 329-332. 



Involution forms, 24-27; production 

 of, by fission of cells before reaching 

 adult stage, 43. 



Iron bacteria, 188-189. 



Isolation, methods of, 86-92 ; of pho- 

 togenic bacteria for studying, 201. 



