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In a previous communication to the Royal Society I have described the formation ofmethenyldiphenyldiamine , a substance which I obtained some years ago, by the action of chloroform on aniline, by means of a new method, namely, by treating a mixture, of phenylformamide and aniline with trichloride of phosphorus. The continuation of these researches necessitated the preparation of phenylformamide, and later also of tolylformamide in greater quantities. I have repeatedly obtained these bodies by the action of formic ether on the corresponding monamine, but in consequence of the difficulties with which the preparation of formic acid in large quantities is still beset, I have of late returned to the old method, viz., distillation of the oxalate of the mon­mine, since I found that by employing the materials in the appropriate proportions, the formation of very large quantities of the formyl com­pounds may be readily accomplished.

II. Transformation of the aromatic monamines into acids richer in carbon