628 Mr . nairne’s Account of 
Subftances put Into the receiver. 
Weight 
when put 
into the 
receiver. 
Degree of exhauf- 
tion according to 
Barom. 
g a ge. 
Pear- 
gage- 
EXP. VII. Tallow, — — 
2 ounces 
43 1 
600 
exp. yin. Oil, - — — 
2 ounces 
377 
480 
exp. ix. Allurn, — — 
Exp. x. A piece of leather as it came from the \ 
2 ounces 
37 & 
58° 
leather-fellers, — — - — J 
exp. xi. The fame piece of leather foaked 
1 00 grains 
152 
100,000- 
in the fame two ounces .of tallow and oil i 
melted together, — — J 
43 * 
800 
From thefe experiments it appears, that the elaitic 
vapour which caufed fo great a difference in the tefti- 
mony of the gages, arofe principally from the leather,, 
and but little from the tallow, oil, or allum : it even ap- 
pears by the tenth experiment, that it came from the 
leather, and fupplied the place of the exhaufted air lb 
faff, that I could not (at leaft in the ten minutes) make 
the barometer-gage indicate a degree of exhauftion of 
of more than 159. 
To determine whether it was the moiffure in the lea- 
ther from which the vapour arofe, I made the following 
experiments. 
Sub- 
