148 PotLoK— On the Extraction of Glucinum from Beryl. 
To test the purified basic carbonate of glucina for alumina, 2 grams were 
dissolved in 10 cc. of hydrofluoric acid, and 250 cc. of water added, and then 
5cc. of a 20 per cent. solution of acid potassium fluoride, and the precipitated 
double fluoride of potassium and aluminium filtered off, washed, dried, burned, 
and weighed. The result gave :022 grams of precipitate, corresponding to :28 per 
cent. of alumina. The undissolved residue when tested in the same way gave 4:49 
per cent. of alumina; and the hydrofluoric acid solution, when decomposed by 
sulphuric acid, and precipitated by ammonia, gave °844 grams of GIO, corre- 
sponding to 42°2 per cent. of glucina. 
VII. Guuctnum Hyprate. 
A quantity of hydrate was now prepared by dissolving the pure basic 
carbonate in hydrochloric acid, washing, and drying at 100°C. The precipitate 
was very bulky and gelatinous, drying to a white, and very light and bulky, 
amorphous powder. On ignition, two different samples gave— 
1:511 grams dry hydrate gave °802 gram = 53:08 per cent. G1O. 
ALON eae 5 9 WO oy Ss oekad (GRO, 
This corresponds to the formula 4G105H,0. 
VIIL. Guuctnum SULPHATE. 
A quantity of the purified basic carbonate was now dissolved in dilute 
sulphuric acid, filtered and left to crystallize over sulphuric acid in the air-pump, 
and gave a good crop of large crystals. From the mother-liquor, a second crop 
was obtained. The first crop gave, on ignition of 1 gram, ‘146 and -145 gram of 
glucina, equal to 14°55 per cent.GlO. The formula of the sulphate is GISO,4H,O, 
and for this theory requires 14°17 per cent. G1O. 
An analysis of the second crop by solution and precipitation gave :— 
Theory. 
Per cent. Per cent. 
Glucina, we ce 14°34 14°17 
Sulphur trioxide Nor 46:60 45°17 
Water, oe .. 39:06 40-66 
100-00 
The first crop was in much finer crystals than the second ; and it was unfortunate 
that the complete analysis was not done on this portion. Two or three of the 
largest crystals were placed on a watch-glass, and put in a dessicator over 
sulphuric acid, and weighed from day to day. The first day there was a very 
slight loss of adhering moisture, but afterwards there was no further loss of 
