IN 1912 the present authors, having located in the harmine molecule a methyl group similarly situated t o t h a t in quinaldine, suggested that the alkaloid contains a fused ring system comprising a benzene, pyrrole, and pyridine nucleus, and constructe'd a constitutional formula (T., 101, 1775) which satisfied the requirements of the facts then known.This expression (I) was discarded by 0. Fischer (Ber., 1914, 47, 99) in fayour of the formula I1 on account of his VOI, cxv.
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Perkin et al. (1919) studied this question.
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