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In a paper communicated to the Royal Society about a year ago, I pointed out the existence of an acid holding to naphthaline the same relations which obtain between benzoic acid and the hydrocarbon benzole. I have since prepared this compound on a somewhat larger scale, and I beg now to submit to the Royal Society some of the results which I have obtained in its examination. The material used in preparing the new acid isnaphthylamine , the monamine of the naphthyl series. This substance, presenting an exclusively scientific interest but a few years ago, is now produced on an industrial scale. It is more especially a beautifully crystallized yellow colouring-matter (Manchestery ellow), thedinitronaphthylic acid , discovered and first employed as a dye by Dr. Martius, which is largely manufactured from naphthylamine. The base occurring in commerce is far from being pure. It is generally met with as a brown fused mass, containing more or less resinous matter and, more particularly, a considerable amount of naphthaline. The purification of the commercial product presents some difficulties; still tolerable crystals may be obtained by crystallization from petroleum.

proceedings of the royal society of london

I. Transformation of the aromatic monamines into acids richer in carbon.—II. On menaphthoxylic acid, the naphthaline-term corresponding to benzoic acid