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In a former communication by one of us, a process was described by which leucic acid was obtained synthetically by the substitution of one atom of oxygen in oxalic acid by two atoms of ethyl. The relations of these acids to each other will be seen from the following formulæ :-

II. Notes of researches on the acids of the lactic series.—No. I. Ac­tion of zinc upon a mixture of the iodide and oxalate of methyl

II. Notes of researches on the acids of the lactic series.—No. I. Action of zinc upon a mixture of the iodide and oxalate of methyl