Tungsten and Tellurium. 409 
12. Other experiments were made upon the metal, (not the 
oxyd.) It gave to strong sulphuric acid, (simply by standing 
in it in the cold) an amethystine color, which disappeared as 
the acid grew weaker, by attracting water from the air. 
13. With nitric acid it formed a colorless solution, not de- 
composed by water. 
14. It did not dissolve in muriatic acid, till a few drops of 
nitric acid were added. 
15. The white oxyd heated with charcoal in a small coated 
recurved glass tube, afforded brilliant metallic globules, which 
rose by distillation, collected in the bend of the tube, and re- 
sembled drops of quicksilver, except that they were solid. 
C. REMARK. 
The above facts having induced the conclusion that the 
metal, thus unexpectedly discovered in the ores of tungsten, 
was tellurium,* we were led to search for external characters 
by which to judge what specimens contained it. 
from Transylvania, (the only telluric ores with which we are 
acquainted,) bearing no analogy in appearance or composition 
to those before us, we were led to inquire whether the tellu- 
rium inthese latter ores was in combination with tungsten, or 
merely in mixture. The external characters detailed in part 
Il, tend perhaps to fortify the latter opinion. If we mistake 
not, we there founda proper ore of tellurium mixed with a 
proper ore of tungsten, but we have also by chemical means, 
found tellurium where similar external characters were not 
apparent. Before the appearance of our next Number, we 
hope to obtain purer and better specimens. In the mean time 
we add the following facts. 
1. A crystal, and a massive piece of the kind described 
under part I, and specimens of two varieties of those described 
under part Il, were digested in nitro-muriatic acid. 
* Several of the facts, we are aware, accord with the properties of bismuth, 
between which and tellurium there are several strong points of resemblance, 
buta number of other facts appear irreconcileable with the properties of that 
metal, andof every other except tellurium. 
