copper—also of eras mereury, and tin. It as 
aheen on the other hand, that ate. of the alumina clase 
into numerous, gum-like soluble, subacid combinations. 
The examination of the glucina compounds was therefore 
tered upon with no little interest; because in determining 
which side of the line this oxyd falls, there was reason for 
ing to throw some new li ier on a still controverted subject. 
With glucina obtained by the method of Berthier, it was 
und impossible to make a pure nitrate by crystallization. But 
from a solution of the imperfectly purified earth in sulphurie 
acid, it is easy to get a pure sulphate in large, See 
edral crystals, that admit of being was drained, ane 
are quite sod aaa in the air. A nitrate free from alumina was 
y decomposing the eee sulphate with nitrate 
of Det bag It crystallizes with so Gee bes and the: 
to Be ‘ae This nitrate therefore differs from most scat incon- 
taining only three equivalents of water, instead of six, to one 
nitric acid. Its point of fusion was found to be abou 140° ae 
Melted ox left alone, it began to crystallize when the ins 
thermometer stood at 93°. On stirring, the en fell two 
) i degrees, and then rose es to 137°. 
ta in the cold, only enough baryta being taken up to 
the acid. But b sree boiling with. carbon- 
1 baryta, the glucina is * all precipitated as a high ly basic | 
3 Labaliiont of the case may serve to reconcile the con- — 
accounts of roma observers, some of whom assert 
not th é 
down by carbonate of lime, wh 
