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

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.