[ is) | 
XI. 
ON THE EXTRACTION OF GLUCINUM FROM BERYL. 
By JAMES HOLMS POLLOK, B.Sc. 
[Read, May 17, 1904. } 
I, Inrropuction. 
In the course of a recent research on the heat of formation of Glucinum Chloride, 
I extracted a considerable quantity of glucina from beryl; then prepared and 
carefully analysed the hydrate, basic carbonate, sulphate, and anhydrous 
chloride; and finally extracted the metal. During the progress of this work 
many modifications were introduced in the method of extraction that greatly 
improved the process, and made it much more easy and convenient in practice, 
and gave a product almost free from iron and alumina. [very effort was made to 
make the glucina as pure as possible; and the analyses of the various preparations 
were very carefully done, so that the fact that they do not agree with theory 
points to the desirability of farther investigation on the composition of beryl and 
the atomic weight or equivalent of glucinum. 
I wiil first give a short synopsis of the work done by others, and afterwards 
the results of my own experiments. 
II. Hisrorican Account. 
The distinguished crystallographer Haiiy, having noted the identity of form of 
beryl and emerald, requested Vauquelin* to make a careful analysis of the former. 
This Vauquelin proceeded to do, fusing the beryl with three times its weight of 
caustic potash, and separating the silica in the usual way. He then precipitated 
the earths by carbonate of potash, digested the precipitate with caustic potash, 
and noted that, from the caustic potash solution, a portion amounting to nine per 
* Ann, Chim., [1], vol. xxvi., 1798, p. 150. 
TRANS, ROY, DUB. SOC., N.S., VOL, VIII., PART XI, 2B 
