CONTENTS ix 



CHAPTER VIII. 



BACTERIAL METABOLISM PRODUCTS 



Physiologic Classification 82 



Carbohydrate Metabolism 82 



Acid Production 84 



Acetic Acid 85 



Lactic Acid 85 



Butyric Acid 86 



Other Acid Fermentations 87 



Oxidation of Organic Acids 87 



Fats 87 



Products from Nitrogenous Compounds 87 



Indol and Skatol 89 



Amins 90 



Pigments 91 



Chromophorous Bacteria 93 



Chromoparous, or True Pigment-forming Bacteria ... 93 



Parachrome Bacteria 93 



Heat ' . 94 



Light , 94 



References 94 



CHAPTER IX. 



INFLUENCE OF TEMPERATURE AND LIGHT ON BACTERIA 



Temperature and Speed of Reaction 95 



Relation to Heat 96 



Thermophilic or Heat-loving Bacteria 96 



Psychrophilic Bacteria 96 



Mesophilic Bacteria 97 



Thermal Death Point 99 



Cold 100 



Light . 101 



CHAPTER X. 



EFFECT OF OTHER AGENTS ON BACTERIA 



Radium Rays "... 103 



Rontgen Rays 103 



Electricity 103 



Drying 105 



Osmotic Pressure 106 



Pressure 106 



Shaking 107 



CHAPTER XI. 



EFFECT OF CHEMICALS ON BACTERIA 



Chemotaxis 108 



Disinfectants 110 



Laws Governing the Actions of Disinfectants Ill 



Disinfectants of the Chlorine Group 114 



Formaldehyde 116 



Sulphur Dioxide . . 116 



Hydrocyanic Acid Gas . 117 



Mercuric Chloride 117 



References . 117 



