viii CONTENTS 



PART II. 

 PHYSIOLOGY. 



CHAPTER VI. 



General Condition for Growth. 



Occurrence 49 



Moisture 51 



Temperature 52 



Light 54 



Oxygen Supply 56 



Osmotic Pressure 58 



Electricity 59 



Radiations 59 



Pressure 59 



Mechanical Vibration 60 



High Frequency Vibrations 60 



CHAPTER VIL 

 Chemical Environment. 



Reaction of Medicine 61 



Injurious Chemical Substances 61 



Chemical Composition 61 



CHAPTER VIII. 



Chemical Environment (Continued). 



General Food Relationships — Metabolism 66 



Carbon Metabohsm 68 



Oxygen Metabolism 69 



Nitrogen Metabolism 70 



Sulphur Metabolism 70 



Limitation of Growth 74 



Mutation 75 



Life Cycles 75 



Why Cells Divide 76 



Growth Accessory Substances 77 



CHAPTER IX. 



Physiological Activities. 



Fermentation of Carbohydrates 78 



Splitting of Fats 87 



