THE nature of the enzymes was a matter for con siderable spectlation so recently as twenty years ago, and the isolation of the gastric proteolytic enzyme pepsin by Dr. John H. Northrop in 1930 as ...

THREE zymogens of proteolytic enzyme in pancreas (two chymotrypsinogens and trypsinogen) are known at present. In this communication, we report the occurrence of another inactive precursor of ...