The Amount and the Distribution of Creati- Nine and Creatine in Normal Human Blood

Of the non-protein constituents of blood, some, such as potassium,’ phosphoric acid,‘, 3 lecithin,3 free cholestero13* 406 and amino-acids,S * 7, 8 are localized to a greater or smaller extent within the corpuscles; some, such as sodium,l calcium,l chlorine,’ cholesterol esters,s glucose,g and adrenalin,‘O are more abundant in, or even entirely confined to the plasma; some, finally, with urea6* l1 as their most conspicuous known representative, maintain a practically equal concentration in both. There are few important constituents of which the relative concentration in