INDEX 



169 



Tryptophane, inability of 

 body to synthesize, 156. 



influence of, on mainte- 

 nance and growth, 155, 

 156. 



value of, in gelatin feed- 

 ing, 137. 



value of, in zein feeding, 



139, 140, 141. 

 Tyramine, 41. 

 Tyrosine, 14. 



absence of, in gelatin, 23, 

 137. 



amounts of, in proteins, 

 22, 23. 



catabolism of, 105. 



relation of, to homogen- 

 tisic acid, 115, 116. 



value of, in gelatin feed- 

 ing, 137. 



value of, in zein feeding, 

 139, 140. 



Urea, 93. 



formation, 70, 71, 72, 98, 



99. 



Uric acid, 93. 

 Urine, composition of, 92, 



93. 



Utilization, of amides, 134. 

 of amino acids, 127, 130. 

 of ammonium salts, 133, 



134. 

 of protein, parenterally 



introduced, 51. 



Valine, 13. 



amounts of, in proteins, 

 22, 23. 



in blood, 55. 

 Variety in diet, 143. 

 Vitellin, 8. 



"Wear and tear" quota, 89. 



Zein, absence of lysine and 

 tryptophane in, 137. 



deficiencies of, in amino 

 acids, 155. 



effects of feeding, 141. 



feeding experiments with, 



139, 155. 



influence of, upon growth, 

 139. 



influence of, upon growth 

 and maintenance, 155. 



influence of, upon survi- 

 val periods of mice, 139, 



140, 141. 



