C 5 2 ° ] 
two gallons more of water were put into the body, 
and the fire made as before, and continued till there 
was 7 lb diftilled of weak volatile fpirit; this an- 
fwers better than water for a frefh diftillation of fal 
ammoniac and lime. 
During the firft 16 hours of the diftillation, there 
continually efcaped through the water of F elaftic 
air very (lightly charged with volatile alkaly, efpe- 
cially when the water grew hot; but during the 
remaining time of the diftillation, no elaftic air was 
fet free. 
Two ftone gallon bottles, with three quarts of 
water in each, were made ufe of to condenfe the va- 
pours ; and when one bottle was grown warm by 
the fumes, the other was put in its place, while it 
was a cooling in a vefiel of cold water ; and fo con- 
tinually changed during the whole operation. The 
fix quarts of water encreafed by this means 2 lb and 
4. in weight; and, by the following experiments it 
appears, that a pound of this vapour condenfed in 
the water is to a pound of the volatile alkaly, which 
was fet apart for Eau de luce, as 140 to 76, which 
is nearly twice as ftrong ; therefore there was a fav- 
ing of near lb of volatile alkaly, which would 
have been loft in the common manner of diftilla- 
tion, 
The water of the two ftone bottles charged with 
alkaline vapours was mixed, in order to reduce 
. them to the fame degree of ftrength, and as much 
of it was put into a glafs cucurbit as contained four 
ounces of the alkaline vapour; four ounces of the 
volatile alkaly, which was fet apart for Eau de luce 
was put into another cucurbit of the fame fize. 
1 
