\ .—... .1 I : .• -• . • v *: ’! ' :u:rnoO ; : i ;m;\v A CHEMICAL AN A L Y SIS, l~c. ' Read, before the ROYAL SOCIETY, November 18, 1802. Notwithstanding the experiments of Bergman and others, on those ores of zinc which are- called calamine, much uncer tainty still subsisted on the subject of them. Their constitution was far from decided, nor was it even/determined whether all calamines were of the same species, or whether there were se veral kinds of them. The Abb6 Hauy, so justly celebrated for his great know ledge in crystallography and mineralogy, has adhered, in his late work,* to the opinions he had before advanced,-f that calamines were ,all,of one species, and contained no carbonic acid, being a simple calx of zinc, attributing the effervescence which he found some of them to produce with acids, to an acci dental admixture of carbonate of lime, 1? The y , folio wing experiments were made to obtain a more certain knowledge of these ores; and their results will show the necessity there was for their farther investigation, and how wide from the truth have been the opinions adopted con cerning them. Calamine from Bley berg. f a. The specimen which furnished the subject of this article, * Traile de Mineralogit, Tome IV. f Journal da Mines. B