THE PROTEINS 23 



amino acids obtained by hydrolysis from proteins 

 representing various groups of these substances. 



TABLE II. 



QUANTITATIVE COMPARISON OF AMINO ACIDS OBTAINED 

 BY HYDROLYSIS FROM PROTEINS 



(Compiled by T. B. Osborne, 1914)* (After Mendel) 



65.49 48.85 84.73 



1.87 82.28 57.43 



These analyses are combinations of what appear to be the best de- 

 terminations of various chemists. 



It may be seen from these tables that certain pro- 

 teins, as serum albumin and casein contain no glyco- 

 coll, whereas serum globulin contains a small amount 

 and gelatin a large quantity. Alanine presents vari- 

 able figures but is usually present. The same may be 

 said of leucine, phenylalanine, proline, and aspartic 

 acid. Tyrosine may be absent as in gelatin. Glutamic 



