DENSITIES OF ALCOHOLIC LIQUIDS. 
321 
tity of water, and then added a sufficient quantity of double 
phosphate to precipitate the whole of the magnesia; I assist- 
ed the separation by a gentle heat, received the precipitate on 
a double filter, washed with a little water, and dried on filter, 
at about 100° Fahr. By calculating the ammonio-phosphate 
of magnesia thus procured, to contain nineteen percent, of 
magnesia (which was proved by a comparative experiment 
made exactly in the same way with Epsom salts alone,) it 
gave me the original quantity in the mixture. I also submit- 
ted the ammonio-phosphate of magnesia to a red heat, and 
calculated the magnesia from the remaining magnesian phos- 
phate (allowing thirty-nine per cent, magnesia,) with the 
same result. It now remained to separate the two alkalies; 
which was done by procuring their sulphates, by evaporating 
the filtered liquor and washings, and proceeding as in the 
first case. 
It should not be concealed that there was a little deficiency 
here in the obtained weight of the sulphate of potassa, and 
consequently a corresponding inferred weight in the sulphate 
of soda, arising undoubtedly from the impossibility of copi- 
ously washing the ammonio-magnesian phosphate, on account 
of its partial solubility. 
I have proved, by my own experience, the simplicity and 
speediness of the operation, by separating and weighing the 
three substances in little more than two hours. 
London Pharm, Transactions* 
ART. LVI. — TABLE OF THE DENSITIES OF ALCOHOLIC 
LIQUIDS. By H. Beasley. 
The annexed table, drawn up for my own use from the 
best sources within my reach, may, perhaps, be acceptable to 
some of your readers. I trust it will be found sufficiently 
correct for all practical purposes; but should any material 
