Vlll CONTENTS 



CHAPTER IV 



PAGE 



CIRCULATION, RESPIRATION, AND EXCRETION 123 



i. Circulation .......... 123 



2. Respiration 132 



3. Excretion 139 



CHAPTER V 



METABOLISM 144 



i. General conception . . . . . . . .144 



2. Enzyms as agents in metabolism . . . . . .148 



3. The metabolism of the carbohydrates 152 



4. The metabolism of the simple proteins . . . . .160 

 5. The metabolism of the nucleoproteins . . . . .168 



6. The metabolism of the fats .171 



7. Metabolism of ash ingredients 178 



8. Functions of the nutrients 182 



CHAPTER VI 



THE BALANCE OF NUTRITION 192 



i. General conception . . 192 



2. Methods of investigation 194 



3. The balance of matter . 202 



4. The balance of energy . 216 



5. Significance of results 241 



PART III 

 THE FEED REQUIREMENTS 



CHAPTER VII 



THE FASTING KATABOLISM 249 



i. The protein katabolism in fasting 251 



2. The energy katabolism in fasting . . . . . .256 



3. Conditions affecting the fasting katabolism . . . .258 



