[ 5 3 9 ] 
The (pint of fait which was difilled, 1L 
weighed i 
The quart of water increase! in weight 
The caput mortuum weigh’d ' 2 
The lofs in the operation was only 
3 5 
2 5 
5 4 
3 4 
■3 
3 12 
The operation was continued till the fal ammo- 
niac began to fublime. 
When no more air ©leaped, which might eaflv 
be perceived by its ceafmg to bubble through the 
water, the veiTel of water was taken away, and the 
tube was immerfed in a bafon of quick fiver; the 
mercury rofe in the tube 23 inches and a half, whilft 
the recipient was too hot to bear one’s hand on it 
longer than half a minute; when the recipient was 
quite cold, the mercury rofe to 29 inches and JL., 
and there was near one inch of fpirit of fait on its 
furface. This experiment was tried the nth of 
November, when the barometer was at 30 inches. 
In order to make this experiment fucceed, it is of 
the utmoft confequence to lute well the vefiels. 
On the Marine /Ether. 
The Marquis De Courtenveau, of the Royal Aca- 
demy of Sciences of Paris, has publiihed a very 
curious memoir in their Tranfadtions, on the mak- 
ing of Marine iEther, by diddling fpirit of wine 
with the * liquor fumans of Libavius ; but no one, 
that I know of, has fucceeded in making it with 
the pure fpirit of fait. It was natural to conclude 
* The liquor fumans is made by diftilling mercury fublimate 
with tin, and is compofed of the acid of fait united with tin. 
Vol. LVII. Y y y from 
