594 



PHYSIOLOGICAL CHEMISTRY 



The rat receiving Diet 2 will grow normally because of the high lysine content 

 of gelatine. The animal receiving Diet i will fail to grow properly because of 

 lysine deficiency. See Figs 184, 185, and 186. 



3. Influence of Carbohydrate Deficiency. Carbohydrates occupy 

 a very prominent place in the diet of man. That they are not essential 

 dietary constituents, at least for the white rat, may be shown by the 

 following experiment. 1 



FIG. 185. RAT RECEIVING WHEAT PROTEIN AND GELATINE. THIS DIET CONTAINED 



SUFFICIENT Lysine. COMPARE FIG. 186. 

 (Hawk, Bergiem and Smith: Unpublished data.) 



Demonstration on Carbohydrate Deficiency. Use young white rats as 

 subjects and proceed as in experiment i, p. 580, feeding one rat Diet i and 

 another rat Diet 2 as given in the following table : 



CARBOHYDRATE DEFICIENCY DIET 



^sborne, Thomas B., and Mendel, Lafayette B.: Soc. Exp. Biol. and Med., 18, 136, 

 1921. 



2 The yeast is fed separately 0.5 gram to each rat. It may be fed as pills made from 

 moistened yeast. The only carbohydrate present in Diet r is the very small amount in 

 the dried yeast. 



