Communications to the Editor 1391 lyst at atmospheric pressure. About one molar equivalent of hydrogen was absorbed. The product obtained by drying the filtered solution from the frozen state was a white granular solid which showed (a)2SD -88.7°(e, 1.0 in water), and had an activity of about 750 units/mg. as compared with 800 units/mg. for streptomycin.Dihydrostreptomycin trihydrochloride was converted to the trihelianthate as described for streptomycin.1 A sample of the trihelianthate after recrystallization three times melted at 215-225°( dec.), activity about 400 units/mg. Anal.
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