Tungsten. *3* 1 find he now calls them fpargelftetn; as the phofphoric acid has not yet been found in them, it is not certain that they belcng to this fpecies. Do they not belong to that of ftronthian ? Iph Speciei. Combined with the Tungftenic acid. Tungsten. Infoluble in water, and neither effervefces not diffolves in acid s. Pulverized and digefted in a moderate heat, either with the nitrous or marine acid* it affumes a yellow colour. Expofed to the blow-pipe, it decrepitates, but is infufible. Mineral alkali attacks it with fome «ffervefcence, and borax without any ; but with microcofmic falt it rüns into a bead of a blue colour, without that rednefs by refradtion which is produced by cobalt. It is decompofed by JR. formed of equal parts of nitrous and marine acids in a boiling heat. By repeating this procefs with frefh por- tions of acid, the calcareous part is at length taken up. The tungftenic acid, that then remains undiffolved, affumes a blue colour when heated to rednefs, and lofes its ufual yellow colour, beco- ming white by theaffufion of cauftic volatilealkali. It poffeffes, in a Word, all the other propertics of tungftenic acid *. * 4 Berl. Beob, 321. K % Sj><