C. A. Joy on Glucinum and its Compounds. 87 
and evaporated, care being taken to prevent the formation of 
nearly insoluble fluorid of aluminum by too great heat. 
is method’ for the analysis of silicates is one of the best 
ever proposed, and, as fluor spar is abundant, there is no reason 
why it should not be frequently applied. 
6. By ferrocyanid of potassium.—The method of Corbelli,‘ for 
obtaining aluminum from its compounds, was applied to beryl. 
Fifty grammes of beryl and thirty grammes of sulphuric acid 
were digested for two hours, and the heat raised to 500° C. 
r cooling, one hundred parts of dry ferrocyanid of potas- 
sium and seventy parts of chlorid of sodium were waded 
the mass exposed to the highest heat of an anthracite fire. The 
_ result was a button of iron, but no glucinum. The beryl was 
_ only slightly decomposed. A trial with an alumina salt also 
es 
ieided a button of iron, but no aluminum. 
7. By fusing with fluor spar.—One hundred and eight parts of 
beryl and one hundred and sixty parts of fluor spar fused very 
readily, but required close attention to prevent the mass from 
Tunning through the iron crucible. The complication in the 
separation of the earths, occasioned by the introduction of so 
_ much lime, was found to be inconvenient in this method. 
r 
_ 8. By caustic lime.—T wo parts of beryl and one part of caus- 
tic lime were fused in a hessian crucible. The mass mel 
9. By litharge—One hundred grammes of beryl were intim- 
ately mixed with three hundred grammes of litharge in an iron 
crucible, and gradually heated to fusion. The mass was t 
stirred with an iron spatula, and poured upon a marble slab. 
The cold slag had a dirty yellow color, and was soft and easy to 
pulverize. It was reduced to a fine powder, moistened with 
Water, digested in an excess of nitric acid, and evaporated to 
dryness. The silica was separated, and the filtrate was left 
_ lead was separated by sulphuric acid, and the requisite amount 
of sulphate of ammonia then added to form an alum with the 
sulphate of alamina. This method with litharge proved to be 
* Wes; ' ‘ii 19. ‘R inv., Oct. 1858, 300. 
het kids... 
"i 
