CHEMICAL COMPOSITION OF PROTEIN MOLECULE 81 



The correspondence between these figures and the actual amounts 

 of amino acid isolated from the protein is fairly good The high 

 proline content of gelatin was well known, but the non-amino nitrogen 

 content of 1 5 per cent, of the total nitrogen of this protein is very 

 striking. Further, the large amount of lysine in haemoglobin was 

 unexpected ; haemoglobin has always been supposed to be composed 

 chiefly of histidine, when the diamino acids were considered. 



Further data will be awaited with interest so that better compari- 

 sons can be made. The present data will no doubt stimulate the chief 

 workers on the hydrolysis of the proteins to obtain better yields of 

 certain of the units. 



FT. I. 



