Abstract
Suramin detns. made on whole blood samples, by the method previously found satisfactory for serum and plasma (Boursnell, Dangerfield and Wormall, Biochem. Jour. 33: 81. 1939), show a low recovery of the suramin. This low recovery is due to constituents of the blood cells. Suramin added to whole blood is almost completely confined to the plasma, and none combines with the red cells. The addition of phenol or merthio-late to serum samples is recommended if these samples have to be kept for some time before detns. are made.

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