Vol. 70 was obtained. This is 62% of the N-ethyl piperidinium benzylpenicillinate known to be present in the original material.Decomposition of Benzylpenicillinic Acid Diisopropyl Etherate in Chloroform.-One gram of the crystalline acid was dissolved in 100 cc. of chloroform and allowed to stand about forty-three hours at 23 during which time an amorphous precipitate formed. After filtering and washing with chloroform 270 mg. of dry solid was thus obtained. After crystallization from ethanol (in which the solid was
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