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[ ** ] atid Annaberg are convincing proofs of it. Silver lias been found in an amalgama with quickfilver in the mines of Salberg. Page 178, line 6, The filver in the alcaline limeftone of Mr. Jufti, from Annaberg, is native, as appears when it is polifhed. Page 182, after line 2, 3. Tin-fpar refembles a white calcareous fpar; but its conftituent parts are more compabt, and its weight greater. Some writers, and even our O u . _ . author, have doubted that it contained tin. It is found, very feldom, at Shlakkenwalde in Bohe mia, and contains tin, as I am credibly informed. There is likewife a heavy mineral, very like tin- fpar, but without any particle of that metal in it. Page 182, line 17, after//#. Note. Mr. Bergman, on the haft page of the fecond volume of his Theory of the Earth, Upfal, 1766, mentions an account from M. Quilt, communicated to him by M. Rinman, that this gentle man had feen a fpecimen of native tin in afoft ftone, in crvllallized quartz, mixed withfpar, and furrounded with a rind of tin zivitler or tin Hone. Likewile fee the Swedith Tranfa&ions, vol. XXVII. p. 231, of the Swedifh .original edition, and Linne Hy/t. Nat. ed. xii. vol. III. p. 236. In 1766, the then librarian of the Royal Society, M L)a Coda, Ihevvcd me this fpecimen, which he has briefly delcribed in.the Phil, Travf vol. LVI. p. 3;. But upon examining the remaining part of this fpecimen, at Truro in Cornwall, where there was llill fome of it for my collec tion, and to fatisfy my curiofrty, in prefence of the chief fupervifor of the mines there, a red-hot iron foon convinced us, that the fo called quartz, and fpar cryftals, were a pure cryftalline arfenic. The-rind of zwitter, mentioned before, held 83 pounds of tin in the pound, and coloured the crucible of a fnowy white. I com municated this obfervaiion to M. Da Colfa, who immediately acknowledged his miihke. See the fame vol. of the Tranfadt, p. 303. However, this fpecimen alone is not fufficient to place tin among thofe metals which are found naturally in their native hate. See the Comment. Lipf. vol. XV. p. 4*98. I fhall on another occafion communicate lome further obfervations on this fubjeft, Page