. Transactions of the American Philosophical Society. s analogous to sassarubrin. To those resins the names of cinnarubrin and clovorubrin may beseverally assigned. Cinnarubrin may be evolved by adding oil of cin-namon to equal parts of sulphuric acid and water, previously mixedand refrigerated, the temperature being subsequently elevated till themass rises up in a foam ; when the whole should be poured into asolution of pearlash, from which the resin may be extricated by astrainer. It is analogous to sassarubrin, but is less efficacious in colour-ing sulphuric acid, and does not, like the for
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. Transactions of the American Philosophical Society. s analogous to sassarubrin. To those resins the names of cinnarubrin and clovorubrin may beseverally assigned. Cinnarubrin may be evolved by adding oil of cin-namon to equal parts of sulphuric acid and water, previously mixedand refrigerated, the temperature being subsequently elevated till themass rises up in a foam ; when the whole should be poured into asolution of pearlash, from which the resin may be extricated by astrainer. It is analogous to sassarubrin, but is less efficacious in colour-ing sulphuric acid, and does not, like the former, impart to the sidesof the containing glass a rich red colour. Moreover, it appears to bepartially insoluble in alcohol, and to retain sulphuric acid after beingboiled with an alkaline solution. I infer that a new series of resins may be evolved from the essentialoils by their reaction with sulphuric acid; which, having a generalanalogy to each other, may still have discriminating characteristics, arising from the oils whence they may be derived.. ARTICLE XIX. Process for Nitric Ether, or Sweet Spirits of Nitre, by means of anapproved Apparatus. By R. Hare, M. D., fyc, fyc, fyc. The reaction of nitric acid with alcohol is so difficult to regulate, in the ordinary mode of making nitric ether in which the whole ofthe materials are mingled at the outset of the process, that I was in-duced, about twelve or fifteen years ago, to introduce an apparatus inwhich they were gradually added together within a glass bottle, bymeans of glass funnels with glass cocks. Subsequently I adopted the more simple apparatus represented inthe accompanying figure. Providing a bottle with three tubulures, let one tubulure communi-cate, by means of a recurved tube A, with another tube passing per-pendicularly through an open-necked inverted receiver C, and enteringvol. v.—4 R 364 APPROVED PROCESS FOR NITRIC ETHER. a bottle surrounded with ice and salt, occupying a suitable vessel B B.The cavity of th