Note 72 — Art. XVII. Additional Notice of the Tungsten and Tellurium, mentioned in our last Number.

This was most remarkably perceived on one occasion, where, under the idea that possibly chrome might exist in the ores, they had been intensely heated in a forge along with pearl ashes. The mass, when lixiviated, gave only a greenish solution, becoming colourless by nitric acid, and again greenish by an alkali; this was supposed to be owing to iron and manganese. No metal was obtained, except a few minute globules of attractable iron, but the laboratory was filled with white fumes, having the peculiar odour alluded to.