[ 52 6 ] 
part muft confid of whiting; and, if any acid of 
vitriol in the acids, of whiting and felenite. 
In order to feparate the felenite from the whit- 
ing, a large portion of diddled vinegar was made 
uie of, which diflolves the whiting, it being a cal- 
careous earth ; and in order to promote the folution, 
heat was made ufe of. 
The undiflolved part of (a) being perfectly fatu- 
rated with a lufficient quantity of diddled vinegar, 
and afterwards repeatedly wadied with pure water, 
and dried, weighed 4 oz. and 26 gr. 
(b) treated as (a) weighed 4 oz. and 52 gr. 
(c) treated as (a) weighed 39 gr. 
(d) treated as (a) weighed 42 gr. 
* One ounce of whiting treated as (a) left 7 gr. 
From thefe experiments it appears, that the 
Four ounces of acid marked (a) contain as much 
acid of vitriol as will make 
4 an oz. lefs 2 gr. of felenite. 
Four ounces of acid marked (b) 
4 an oz. and 24 gr. of ditto. 
Four ounces of the acid vapour marked (c) 
4 gr. of ditto. 
Four ounces of the acid vapour marked (d) none. 
Hence it is evident, that the vapour of the acid 
of fait condenfed in water, when diddled flow, 
contains no acid of vitriol ; and that even when it 
is diddled quick, it contains fo fmall a quantity as 
is not worth notice. 
* As whiting contains fome parts which arc not foluble in 
diftilled vinegar, it was necefl'ary to know how much of this an 
ounce contained, which muft be deducted in proportion to the 
quantity t.fed for the experiments a, b, c, and d. 
If 
