436 



SUBJECT INDEX 



Silage, temperature of, 94 



Silkworm disease, 23 



Skatol, formation of, by bacteria, 89 



Smallpox, 24 



Sodium salts, influence of, on bacteria, 



145 



Soil actinomycetes, 1G9 

 arsenic in, 118 



bacteria, action of, on proteins, 88 

 as formers, 32, 33, 171, 172 

 number of, 161, 162, 163, 164 

 in water, 346, 347 

 biological changes produced in, by 



bacteria, 150 

 definition of, 171 

 flora, 160, 170 

 gain in nitrogen, 248, 287, 289, 315, 



316 



influence of antiseptics on, 127 

 of carbon bisulphid on, 128, 129. 



131 



of freezing on, 100, 101 

 of green manure on, 156-159 

 of heat on, 127, 131, 132 

 of manure on, 150 

 inoculation, 284-287 



methods of, 316-317 

 loss of nitrates from, 236, 238 

 organic constituents of, 193 

 phosphorus, liberation of, 173-175 

 plant food in Utah, 320 

 potassium, liberation of, 180 

 psychrophilic bacteria in, 96, 97 

 temperature, 151, 154, 280, 313 

 Spirillum chplerse asiatica?, 97, 98 



desulphuricans, 178 

 Spirophyllum ferrigineum, 180 

 Spontaneous generation, 18, 19 

 Spores, 44, 45 

 germination, 45 

 resistance, 44 

 Staphylococci in eggs, 393 

 Staphylococcus aureus, pigment of, 93 



survives pasteurization, 392 

 pyogenes albus in putrefaction, 190 

 Streptococcus coligracilis in sewage, 



361 



enteritis in sewage, 361 

 lacticus, absence. of katalase in, 81 

 acid produced by, 85 

 in sauerkraut, 412 

 pyogenes in putrefaction, 190 

 Substrata, 75 



Sugar and salt, as preservatives, 407 

 Sulphates, action of bacteria on, 93 



reduction of, by enzymes, 81 

 Sulphur, action of bacteria on, 175, 



178 



bacteria, 179 

 cycle, 184 



dioxid as a disinfectant, 1 16 

 requirement of Azotobacter, 259 

 of bacteria, 69 



Sulphuric acid, catalytic production of, 



76 

 Symbiosis, 306 



among Azotobacter, 276 



TANNING, 414, 415 



Temperature, and coagulation of bac- 

 terial protoplasm, 96 

 fatal, 98 



influence of, on bacteria, 95, 100, 101 

 on enzymes, 79 

 on denitrification, 245 

 on legume bacteria, 313 

 on manure in soil, 151, 154 

 on nitrification, 230 

 on nitrogen fixed, 279, 280 

 on reactions, 95 

 on soil, 154 

 on water bacteria, 344 

 relationships of bacteria, 97 

 Thallophytes, 30, 31 

 Thermal death point, 99 

 Thermophilic bacteria, 96, 97 



organisms as nitrogen fixers, 279, 



280 



Thiothrix, 179 



Toluene, action of, on soil, 136 

 Toxic compounds in ensilage, 414 

 Toxicity of salt for bacteria, 149 

 Toxins, 91 



bacterial, in soil, 138, 236 

 formation of, in soil, 235 

 influence of heat on, 132 

 Tryptophan, action of bacteria on, 89 

 Tubercles, root, early observations on, 



291, 292 



Tuberculin test, 383, 384, 385 

 Tuberculosis among cattle, 381, 382 



due to milk, 380, 381 

 Typhoid bacilli, resistance of, to lactic 



acid, 387 

 carriers, 399 



cause of, how determined, 355-359 

 character of outbreak of, 355 

 due to milk, 379, 380 



to water, 351, 352, 354 

 para, outbreaks, 397, 398 



UREA, action of bacteria on, 91 

 Urease, 80 



Uric acid, products from, 91 

 Uricarse, 92 



VACCINE, for anthrax, 25 

 Vaccines, 415 



