THE PROTEINS 

 TABLE I. 



91 



TABLE II. DISTRIBUTION OF THE NITROGEN IN VARIOUS PROTEINS 



(VAN SLYKE) 



An improved means of determining the distribution of nitrogen in the 

 protein molecule has been devised by Van Slyke. Some of his results are 

 given in Table II., above. 



* When a protein is boiled for a long time with strong acid, a black precipitate may 

 occur which contains nitrogen. This is known as humin nitrogen. 



