X CONTENTS 



PAGES 



CHAPTER V 



The' Chemistry of Bacteria 



How Bacteria are Studied 42 



Water 44 



Solids 45 



Variation in Composition of Different Parts of the Cell 46 



Toxins 47 



Ptomaines 48 



Enzymes 49 



Pigments 50 



Light 51 



Heat 51 



CHAPTER VI 



Food Requirements of Bacteria 



How Bacteria Feed 53 



Why Bacteria Need Food 54 



Quantity of Food Required 54 



Kind of Food Required 55 



Water 56 



Carbon Requirements 57 



Nitrogen 58 



Oxygen 59 



Vitamines 59 



Ash Requirements 59 



Mutual Relationship Between Plants 60 



CHAPTER VH 



Factors Influencing Bacterial Growth 



Temperature 62 



Cold ". 64 



Light 66 



Electricity 67 



Shaking 6j 



Osmotic Pressure 67 



Pressure 68 



Poisons / 69 



Chemotaxis , , 70 



