100 D. M. Balch on Tellurbismuth from Dahlonega, Ga. 
teroxyd in the usual manner. 
Analysis a. ‘827 grm. gave, 
4256 Bi = 51°46 pr. ct. 
3990 Te = 4826 * 
“8246 99°72 
Analysis b. ‘552 grm. gave, 
2847 Bi = 51°57 pr. ct. 
2690 Te fog 48:78. <% 
5537 100°30 
To ascertain whether this tellurium contained selenium in ap- 
reciable quantity, a portion ("186 grm.) was fused at a dull red 
eat with six times its weight of a mixture of nitre and carbon- 
ate of soda, to convert any selenium present into selenic acid. 
The fused cake was dissolved in water, and a little nitric acid 
and nitrate of baryta added; no precipitate formed, even after 
several days, which proves the absence of selenium, except 10 
minute traces as evinced by the blowpipe test before noticed. 
ore was found to be free from gold, silver andiron. 
The specimen that I have analyzed is therefore a pure tellurid 
of bismuth, Bi Te, ; thus— 
Dahlonega. 
Calculated. a. db. 7 
Bi 208 52°00 51°46 51°57 
Te, 192 48°00 48°26 48°73 
400 100-00 99°72 100°30 
been analyzed 
The tellurbismuth from this locality has 
ve; he also 
already 
by Dr. Genth, with nearly the same results as abo 
finds the same formula for the Fluvanna county, Va., mineral. 
Allow me to offer a few remarks on the compounds of bis- 
muth and tellurium, suggested by an examination of the many 
ublished analyses of this ore from both American and foreign 
ocalities. It appears that selenium is present only in traces, and 
sulphur (where it exists at all) in quantities not exceeding 5 per 
