CONTENTS 



OF THE SECOND VOLUME. 



PART II.— THE VITAL FUNCTIONS. 



Page 



Chapter I. — Objects of Nutrition 1 



Chapter II. — Nutrition in Vegetables 13 



§1. Food of Plants 13 



2. Absorption of Nutriment by Plants 16 



3. Exhalation 23 



4. Aeration of the Sap 25 



5. Return of the Sap 31 



6. Secretion in Vegetables 39 



7. Excretion in Vegetables 46 



Chapter III. — Animal nutrition in General 52 



§ 1 . Food of Animals 52 



2. Series of Vital Functions 62 



Chapter IV. — Nutrition in the lower orders of Ani- 

 mals , 66 



Chapter V. — Nutrition in the higher orders of Ani- 

 mals 94 



Chapter VI. — Preparation of Food 101 



§ 1. Prehension of Liquid Food 101 



2. Prehension of Solid Food 1 05 



3. Mastication by means of Teeth 125 



