SECT. 9] 



PROTEIN METABOLISM 



1057 



amino-acid fraction. Perhaps more serious, therefore, is the divergence 

 between the results of Russo and those of Plimmer & Lowndes over 

 the acids arginine and histidine, for, whereas in the latter they de- 

 finitely though slightly increased, in the former they equally de- 

 finitely decreased. And the mono-amino-acids, which in Plimmer 

 & Lowndes' work decreased, in Russo's work increased, an eflfect 

 seen in both the amino and non-amino fractions. All the changes 

 in Russo's experiments were greater relatively than those in Plimmer 

 & Lowndes'. 



Table 131. 



Russo's figures (massed proteins) : 



Calvery's figures (massed proteins, including shell) : 



% of the total nitrogen 



The third investigation along these lines was that of Calvery, who 

 reversed Russo's findings and agreed with Plimmer & Lowndes that 

 the mono-amino-acids were combusted rather than the di-amino- 



