L y8 J 
Tuts experiment I make bold to fay is fallacious, for the acid 
whofe denfity at 51° was 1,841 fhould have diminifhed only to 
1,836 in the temperature of 60°, and 100 grs. of it fhould then 
contain 87,5 ftandard, or 77,99 of the ftrongeft acid. ‘The con- 
clufion from this experiment is therefore not only incompatible 
with my own but with that of Mr. Berthollet juft mentioned, 
and I believe the caufe of this miftake lay in his having poured 
the barytic folution into the acid inftead of pouring the acid 
into the barytic folution, as Mr. Berthollet had done in preci- 
pitating the folution of lead, or not applying a fufficiency of acet- 
ous barofelinite. 
Tue next inftance I fhall produce, of the agreement of my 
principles with the moft exaé experiments, is the decompofition 
of common falt with the refulting products, as accurately executed 
as ingenioufly contrived by that moft {kilful manipulator and 
f{cientific chemift Mr. Woulfe, in the Philofophical Tranfactions 
for the year 1767. In his third experiment he employed 14 Ibs. 
avoirdupois of common falt and 14]bs. of oil of vitriol, which 
had been previoufly diluted with 7 lbs. of water, and diftilling 
the mixture with a gentle heat, gradually increafed, he obtained, 
in the immediate receiver denoted in his plate by the letter C, 
t1lb. ro0z. of fpirit of falt, and found the more’ diftant re- 
ceivers or bottles containing water deftined to condenfe the more 
volatile fumes to have increafed in weight 3lb. 1o0z. and the 
refiduum in the retort to have weighed 19lbs. 402. all avoirdu- 
pois weight. . 
Thus 
