[ 522 ] 
in a reverberatory furnace on a naked fire ; 14 th of 
common fait was put into it, and on that the like 
quantity of oil of vitriol, which had been diluted 
the day before with 7Tb of water; the retort was 
then immediately luted to the recipient, and the 
didillation conducted in the common manner: the 
operation continued 16 hours, when hardly any 
more liquor would come over with a drong fire. 
To condenfe the vapours, two done gallon bot- 
tles with three quarts of water in each were made 
ufe of, as in the former experiment. 
In this operation there was obtained 9 lb 5 5 and 
7 of fpirit of fait, which dropped into the bottle 
C; the fix quarts of water in the done bottles in- 
creafed in weight 61 b 125 and 7; the caput mor- 
tuum weight 18 Tb 6 fo that in this operation 
there was only a lofs of eight ounces, which is but 
part of the whole, which probably was modly 
eladic air. 
Experiment III. 
The fame operation was repeated with a dower 
fire, which continued for 23 hours, after which 
time hardly any more liquor would come over with 
a drong fire. 
There were here produced n lb io§ of fpirit of 
fait, in the bottle C ; the fix quarts of water in- 
creafed in weight 3Tb io§, and the caput mortuum 
weighed 19 th 4§; the lofs was the fame as in the 
foregoing experiment. 
In order to know the different degrees of drength 
of the acids produced in thefe two experiments, 
they 
