THE results in the precedicg paper were obtained uniformly by the method of first dissolciiig the substance in a mixture of aqueous sulphuric and hydrochloric acids containing 57.3 per cent. H2S04 and 5.5 per cent. HCI, then diluting with hFdrochloric acid of 1.06 sp. gr. and distilling the substance with this acid, fol!owing in this and other respects the process gi7eu by Tollens (Landw.-Vemlchs. Stat., 42,