144 Pottox—On the Extraction of Glucinum from Beryl. 
difference ; and with a great excess of carbonate of ammonia, a much longer time 
was taken for the precipitate to form. ‘This precipitate, on examination, proved 
to consist mostly of alumina, with a little iron and glucina; about 80 grams of it 
were collected, and it will be examined at some future date. 
The clear solution of glucina in carbonate of ammonia was now treated with 
a few drops of sulphide of ammonium, and allowed to stand for two days. The 
black precipitate proved to be for the most part iron, zinc, and nickel, but another 
substance appeared to be present; the quantity, however, was too minute to 
admit of any satisfactory conclusions being drawn regarding it. The pecu- 
liarity of this sulphide of ammonia precipitate was also observed by Kruss and 
Moraht. The carbonate of ammonia solution of glucina, now free from silica, 
alumina, and iron, was boiled up and evaporated to about half its bulk, the 
glucina precipitating as a beautiful white basic carbonate of glucina, containing 
nothing but a small quantity of alumina. The precipitate was dried and bottled 
for use, and will be referred to as crude basic carbonate of glucina. 
A second quantity of 2000 grams was similarly decomposed with caustic soda ; 
but the ground mass was treated with diluted sulphuric acid, and well boiled up 
by steam ; then filtered from the silica, and the solution precipitated by ammonia, 
the precipitate dissolved in sulphuric acid, and potassium sulphate added to the 
solution, which was then evaporated down to the crystallizing point, and allowed 
to cool. Next day the crystals of alum were drained off, the solution re-evaporated 
and the process repeated until a portion of the mother-lquor, when poured into an 
excess of carbonate of ammonia, gave a precipitate that completely redissolved on 
shaking up, though the phenomenon of reprecipitation on standing was again 
observed. ‘This strong solution of glucinum sulphate was poured into saturated 
solution of carbonate of ammonia in quantities of 100 cc. to two litres of carbonate 
of ammonia, and well shaken up in Winchester quarts, dissolving clear, or nearly 
so, and afterwards giving a copious precipitate, as in the previous experiment. 
After filtering off the reprecipitated portion, the solution was treated with sulphide 
of ammonia, and the black precipitate of iron, and whatever else might be there, 
removed, and the solution boiled to separate the basic carbonate of glucina. 
In a third experiment about 4000 grams of beryl were fused as before, 
then treated with an excess of sulphuric acid, and the products systematically 
crystallized out. The excess of sodium sulphate crystallized first, then the soda 
alum, and finally the glucinum sulphate. The glucina was separated from the 
crude sulphate, and mother-liquors, as basic carbonate, and purified as before. 
In a fourth experiment about 4000 grams were fused with caustic soda, and 
treated with sulphuric acid as before; but after most of the alum had crys- 
tallized out, the solution was treated with its own volume of alcohol, which 
