0 . 5 ? Mr. nairne’s Account of 
barometer-gage) feemed to me now fo furprizing, that it 
was impoffible not to wilh to repeat this experiment with 
all the care poffible, and to endeavour to recoiled! all the 
circumftances which I thought could any way influence 
the refult. 
The vitriolic acid I made ufe of in the following ex- 
periments was fome that I had had by me for fome time; 
it had been kept in a phial, flopped with a glafs-ftopper, 
and tied over with a bladder. The thermometer in the 
room was at 5 9% and the weather remarkably dry. 
t ■ - ■ 1 
Weight 
when put 
into the 
receiver. 
Degrees of exhauf- 
tion according to 
A_ 
Variation of 
weight 
during the 
experiment. 
Barom. 
g a g e - 
Pear- 
gage. 
ixp. xlvii, Vitriolic acid in al 
glafs cup, two inches diameter, J 
Exp. xlviii. The laft experi-*} 
ment Repeated with the fame > 
vitriolic acid in the fame cup, J 
Exp. xlix. The former experi- > 
meat repeated again with the 1 
fame vitriolic acid in the fame j 
100 grains 
10 1 grains 
ioif grs. 
602 
502 
502 
380 
350 
3S° 
gained i gr. 
gained \ a gr. 
cup, — — J 
Exp. L. The former experiment^ 
repeated the fourth time in > 
every refpe£l as before, J 
ioif grs. 
502 
340+ 
/ gained a J 
l of a grain. 
The generation of vapour in the exhaufted receiver 
which Mr. cavendish had fuppofed, and which I 
feemed, by my former experiments, to have proved, ap- 
peared fatisfadlorily to have accounted for the pear- 
gage’s 
