INDEX 



339 



Reproduction of bacteria, 42-51 ; by 

 binary division or fission, 42-43 ; 

 among the Trichobacteria, 50-51. 



Resemblance of bacteria to other forms 

 of life, 117-120. 



tion, 165, 168-170. 



Rigor, state of, 136. 



Rontgen rays, lack of bactericidal prop- 



erties of, 162-163. 

 Ross, Alexander, 9. 



Sand flea disease due to photogenic 



bacteria, 201. 



Saprogenic bacteria, 216-227. 

 Saprophilic bacteria, 216-227. 

 Saprophytes, bacteria called, 128, 228- 



232; facultative, 229; found among 



air-borne bacteria, 291292. 

 Sarcina, 16. 

 Scarlet fever, epidemics of, traced to 



milk supplies, 318. 

 Schulze, Franz, 10. 

 Schwann, Theodore, n. 

 Season, influence of, upon air-borne 



bacteria, 291. 

 Septic tank, the, 304. 

 Sewage, bacteria of, 302-304. 

 Sewers, bacteria in air from, 290. 

 Sheaths, 21, 37. 

 Silver salts as antiseptics, 147. 

 Skin, bacteria of the, 319-321. 

 Slime, bacterial masses composing, 



38. 



Slimy milk, bacteria in, 312-313. ' 

 Soil, bacteria of the, 282-287. 

 Sour milk, butyric acid bacteria infect- 

 ing, 210. 



Spallanzani, Lazzaro, 10. 

 Species of bacteria, 283-285. 

 Sphaerotilus group, 24. 

 Spirilla, definition of, 19-21 ; direction 



of division, in reproduction by fission, 



43- 



Spirillaceae Migula, 108-109. 

 Spirochaetes, 20. 



Spontaneous generation theory, 8-13. 

 Spore formation, reproduction by, 46- 



50; chemical structure of, 65. 



Sports, 47. 



Staining methods, applied to study of 

 granules, 57-59; advantages of, in 

 examination of bacteria, 94 ff . 



Staining, principles involved in, 99-101. 



Stains, varieties of, 95-98. 



Staphylococci, 16. 



Steam, sterilizing by, 80-84. 



Stenothermic bacteria, 138. 



Sterilization, process of, 77-84. 



Stomach, bacteria of the, 327-329. 



Streptococci, 15. 



Streptothrix actinomyces, 22. 



Strict, or obligate, parasites, 229-230. 



Structure of the bacterial cell, 5265. 



Subcultures, 91-92. 



Subinfection, process called, 233. 



Sugar-free bouillon, 70-71. 



Sulphur as a disinfectant, 147-148. 



Sulphur bacteria, 15, 104, 111-114, 

 186-188. 



Sunlight, disinfecting and sterilizing 

 properties of, 78; effect of, on bac- 

 teria, 155 ff. 



Symbiosis of bacterial organisms, 164. 



Taxonomy of bacteria, 102-126. 



Temperature, influence of, on bacteria, 

 134-140; rate of, for production of 

 light by bacteria, 200. See Cold and 

 Heat. 



Tetracocci, 16. 



Thallophyta, classification of bacteria 

 as, 119-120. 



Thermal death point, the, 134-135, 138- 

 140. 



Thermophilic bacteria, 136. 



Thiobacteria (sulphur bacteria), fam- 

 ily of, 15, 104, 111-114, 186-188. 



Thiothrix group, 23-24 ; an example of 

 colorless group of sulphur bacteria, 

 186-187. 



Toxic bacterial proteins, 249, 256-257. 



Toxins, 248, 251-254. 



Transmission of bacteria from one in- 

 dividual to another, 239-242. 



Trichobacteria, 21-24; reproduction 

 among the, 50-51. 



