I2 3 



STUDIES IN THE CHEMICAL DYNAMICS OF ANIMAL 

 NUTRITION 



BY S. B. SCHRYVER, D.Sc., PH.D., Lecturer on Physiological Chemistry 

 to University College, London. 



From the Physiological Laboratory, University College, London 

 (Received January -$oth, 1906) 



CONTENTS 



PAGE 



Part I. Problems Relating to the Functions of Nitrogenous Foodstuffs in the 



General Economy of Nutrition ..... 123 



Part II. The Methods for Estimating Residual Nitrogen in the Serum and 



Tissues . . . . . , '.129 



Part III. The Distribution of Nitrogen in the Serum, Liver, and Small Intestine 



during Digestion and during a Fast . . . . 134 



Part IV. The Question of Albumen Synthesis in the Mucous Membrane of the 



Stomach . . ,'.'.,.. . . ..... 143 



Part V. Further Experiments on Autolysis ; the Relation of Autolysis to 



Nutrition .''.'.' . . . . 144 



Part VI. A Theory of Nitrogenous Metabolism .' . . . 157 



PART I 



INTRODUCTION. PROBLEMS RELATING TO THE FUNCTION OF 



ALBUMENOUS FOOD-STUFFS IN THE GENERAL ECONOMY 



OF NUTRITION 



In spite of the fact that metabolism occupies a very important 

 place in the literature of modern physiology, but little is known with 

 certainty of the fate of the products of tryptic digestion of the albu- 

 mens after leaving the alimentary tract. Various theories have been 

 propounded to explain the role of the nitrogenous food-stuffs in the 

 general economy of nutrition, of which that suggested originally by 

 Liebig and modified by Pfliiger has been, perhaps, the dominant.' 

 According to this theory the products of digestion of the albumens 

 are incorporated into the protoplasm molecules of the living cells, and 

 there in a readily oxidisable form, held available for the supply of the 

 energy needs of the organism. 



