Pneumococcus, 313 Pneumonia, 313 Polymorphism, 12 Postulates, Koch's, 266 Potato medium, 22 Pouchet's aëroscope, 96 Proteolytic ferments, 115 Proteus family, 86, 180, 297 -- vulgaris, 60, 86, 151, 194 -- zenkeri, 60 Pseudo-diphtheria bacillus, 296 Ptomaines, 179 Pure culture, 20, 46 Purification of water-- -- natural, 69 -- artificial, 73 Pus, 296 Putrefaction, 143-149 Pyocyanin, 299 Pyoxanthose, 299 Quantitative standard for water bacteria, 48, 49 -- air bacteria, 107 -- milk bacteria, 188 -- soil bacteria, 137 Quarter evil, 19, 171 Rabies, treatment of, 253 -- forms of, 253 -- pathology of, 254 -- results of treatment, 256 Reck's disinfector, 328 Reproduction of bacteria, methods of, 16 Retting, 135 Rinderpest, 320 Saccharomycetes, biology of, 119-121 -- methods of examination, 122 -- anomalous, 122 -- apiculatus, 127 -- aquifolii, 127 -- cerevisiæ, 117, 124, 126 -- conglomeratus, 126 -- ellipsoideus I., 126 -- ellipsoideus II., 126, 134 -- exiguus, 127 -- Hansenii, 127 -- illicis, 127 -- Ludwigii, 122 -- mycoderma, 127 -- pastorianus I., 127, 134 -- pastorianus II., 127 -- pastorianus III., 127, 134 -- pyriformis, 127 Salicylic acid as antiseptic, 205, 206 Saprophytes, 27, 166 Sarcina, 10 Scarlet fever, 202, 321 Sedgwick's method of air analysis, 99 Sedimentation, 71, 73 Septic processes, 296 -- tank, 90 Sewage, organisms in, 84 -- bacterial treatment of, 89 Sewer air, 87 -- and toxicity of bacteria, 105 Shake culture, 62 Shell-fish and bacteria, 229, 234 Small-pox, 251, 321 Soil, bacteriology of, 137 -- examination of, 138 -- kinds of bacteria in, 142-145 -- and its relation to disease, 173, 176, 177 Species of bacteria, 29 Spirillum, definition of, 11 -- of cholera, 66 Spontaneous generation, 2 Spores, kinds of, 17-19 -- resistance of, 19, 278 -- staining of, 19 -- of yeasts, 122 Staining methods, 45 Staphylococcus, 10, 296 -- cereus albus, 297 -- pyogenes aureus, 88, 108, 297 Steam as a disinfector, 326 -- disinfectors, 327-329 -- steriliser, 326 -- saturated, 327 -- superheated, 327 Steam current, 327 Sterilisation, 29-31 -- methods of, 30, 31 Streptococcus, 9, 297 -- pyogenes, 299 -- Hollandicus, 192 Streptothrix, 317 Structure of bacteria, 8 Sulphurous acid as a germicide, 332 Suppuration, 296-301 Swine fever, 320 Symbiosis, 162 Symptomatic anthrax, 171 Table of economic bacteria in soil, 145 Temperature, influence of, on bacteria, 23 Tetanus, 19, 168, 245 -- toxin of, 168 Thresh's disinfector, 328 Thrush, 203 Tissues, effect of, on bacteria, 267 Tobacco-curing, 136 Toxins, 28, 241-247, 272 Tuberculin, 281 Tuberculosis, 274-292 -- pathology of, 274 -- varieties of, 275 -- history of, 276