CONTENTS 



CHAPTER VIII. BACTERIA IN THEIR RELATION TO ONE ANOTHER. 



64. Symbiosis, Metabiosis, Anta- 

 gonism 66 



65. Mixed Cultures . 



FAUE 

 . 6 7 



CHAPTER IX. CLASSIFICATION OF THE BACTERIA. 



66. First Attempt by 0. F. Muller . 69 

 67. Cohn's Classification ... 69 

 68. Billroth's Coccobacteria Septica . 70 



69. De Bary and Hueppe's Classifica- 



tion ...... 71 



70 Pathogenic, Chromogenic, and 



Zymogenic Bacteria 



73 



Section III. Principles of Sterilisation and Pure Cultivation. 

 CHAPTER X. METHODS OF STERILISATION. 



71. Sterilising 75 



72. Freeing the Air from Germs . 75 

 73. Filtration of Drinking Water . . 77 

 74. The Bacterium Filter in the Ser- 

 vice of Enzymology ... 78 



75. Beer Filters 78 



76. Destroying Germs by Dry Heat . 79 



77. Destroying Germs by Moist Heat 80 



78. Intermittent Sterilisation . . 82 

 79. Mineral Antiseptics : Corrosive 

 sublimate, sulphurous acid, car- 



bon dioxide, chlorine and chlo- 

 ride of lime, ozone and hydro- 

 gen peroxide, milk of lime . 84 



80. Organic Antiseptics : Phenol, 

 cresol, creolin, lysol, sapocarbol, 

 solveol> solutol, saprol, salicylic 

 acid, antinonnin, ethyl alcohol, 

 ethyl ether, formaldehyde, iodo- 

 fonn, chloroform, benzoic acid 87 



Si. The Combined Method of Sterili- 

 sation 91 



CHAPTER XI. METHODS OF PURE CULTURE. 



82. Nutrient Solutions ... 94 

 83. The Dilution Method and Frac- 

 tional Cultivation . .96 

 84. Liquefiable Solid Media . . 99 



85. Koch's Plate Cultures Streak 

 and Puncture Cultures Pre- 

 serving Cultures Auxano- 

 graphy 101 



Section IV. Chromogenie, Photogenic, and Thermogenie Bacteria. 



CHAPTER XII. CHROMOPAROUS BACTERIA PRODUCING RED AND YELLOW 

 COLOURING MATTERS. 



86. Coloured and Colouring Bacteria 105 



87. Micrococcus Prodigiosus . . 105 



88. Lipochromes . . . .107 



89. Ked Coloration in Milk, Cheese, 



and Stock-fish . . .108 



90. Bacteria producing Yellow 



Colouring Matters . . . 109 



