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1 Most of these preparations are in reality highly dangerous. Oxides, however, or salts of copper, have been employed internally with success, acting by alvine evacuation and by vomiting. The Crocus Veneris of the old chemists was an oxide of copper. It is still used by the peasants of Silesia, Ajasson says.
2 It is obvious that the "cadmia" here described must be an essentially different substance from the "cadmia" mentioned in the second Chapter of this Book, that being a natural production, possibly calamine or hydrosilicate or carbonate of zinc; while the "cadmia" of this Chapter is a furnace-calamine, a product of the fusion of the ore of copper, or zinc.—B. It is evident, too, that copper ores, impregnated with zinc or calamine, also passed under this name. See Beckmann, Hist. Inv. Vol. II. pp. 33–35, Bohn's Edition, where this subject is discussed at considerable length: also the treatise by Delafosse, in Lemaire's Edition of Pliny.
3 The metal known to us as "cadmium" was discovered by Professor Stromeyer in 1818: it is either associated in its ores with zinc, or forms a native sulphuret.
4 "Smoky residue." None of these substances formed in smelting are preserved for medicinal purposes at the present day. Tutty is an impure oxide of zinc.
5 "Cluster residue." From its resemblance to a bunch of grapes.
6 "Caked residue."
7 "Shell-formed residue."
8 See B. xiv. c. 16.
9 See end of B. iii.
10 See end of B. xii.
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