We recently reported1 isolation from horse brain of a substance, m.p. 175-176°, an -48.3°Chf, diacetate, m.p. 96-97°, aa -27.6°C hf, isomeric

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2 Until recently, the Japanese authors of Akamatsu's school divided the phosphatases into phosphomonoesterases, phosphodiesterases, pyrophosphatases and phosphoamidases and claimed to have demonstrated the specificity ofthe several enzymes. As the whole ofour experiments were made with sodium ,-glycerophosphate as substrate, the enzymes studied by us should be called, according to the terminology ofthe Japanese authors, phosphomonoesterases. However, in a recent work by Hotta [1934] it is shown that the specificity of the phosphatases is not determined only by the nature of the bond which unites phosphoric acid to the alcoholic residue but also by the chemical nature of the alcoholic residue itself. Until such time as the question is settled, we prefer to retain the generic denomination of phosphatases. Biochem. 1935 xxix (1491) 95

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