C:.T Jackowaerelk. 367 
This, cupelled, gives a little gold. In an open glass tube no smell 
of sulphur observed ; a white smoke fills the tube, and condenses 
init. Heated, this deposit forms little yellowish globules. At 
the lower extremity of the tube, a fused metallic mass remains 
adherent to the glass. A little brown sublimate is mixed with 
the sublimed telluric acid, and is selenium. 
One gram of this mineral selected with care, to avoid all ad- 
a of pyrites, was analyzed and the following results were 
obtained : , 
Bismuth, (BO.0:88) .-- eter He nee rt oo 
Tellurium, (metallic)  - . a é ‘ - * 01800 
Selenium, (Ba0+SeO* 0042) - - - - - OO118 
Gold, (mechanically mixed in fine scales) - - - 00060 
MN a5 foie 3. Seca aelt-a) oes eee 
1/0000 
Was evaporated to small bulk, and the nitric acid was decom- 
d and removed by repeated additions of chlorhydrie acid 
and heat until no more chlorine was given off. Then the solu- 
ton was brought to near neutrality by ammonia and a current 
of sulphurous acid gas was passed through it, until all the tellu- 
flum appeared to be reduced. It was then filtered and washed 
With water saturated with sulphurous acid, and the filter which 
d been properly tared was weighed, when dry, at 212 F. 
On addition of'a solution of sulphite of ammonia to the filtered 
of the Bornite, b conyerting the selenium into selenic aci 
cae digestion in nitro tae acid, Then the selenic 
It Weigh odo oe by nitrate of baryta, as seleniate of baryta. 
ev m. os 
eu Separate experiments, it was ascertained that no sulphuric 
ay existed in the solution of the Bornite; hence no sulphur 
48 present, 
*eston, March 12, 1859, 
