A. G. Hogan 159 
wd tT 
fell tet | | oo 
Days 
CHART 4. AThe data shown in this chart are not complete, as the in- 
vestigation was unavoidably interrupted. In spite of the fact that the 
period of these feeding trials was short, however, we believe that it was 
sufficiently long, at least when considered in relation to Chart 3, to admit 
of a final conclusion. 
(* Rats 259 and 261 had been receiving 15 per cent kafirin and lysine? plus 
tryptophane,” and Rat 265 “iad been on a diet of 15 per cent kafirin plus 
lysine plus cystine.? At the point indicated by a all were changed to a 
ration of 15 per cent kafirin plus lysine plus tyrosine.?. The rate of growth 
of the animals was apparently not affected, certainly it was not increased. 
At point b tyrosine was replaced by cystine, and the rate of gain was in- 
creased in all cases. In two instances it was marked. 
