on the fpecific Gravities , & cc. of Saline Sub/lances. 233 
tamed in the 64,71 cubic inches of vitriolic air: therefore, 100 
cubic inches of vitriolic air contain 6,6 gr. of phlogijton , 
71,2 gr. of acid, and 100 cubic inches of this air weighing 
77 8 gr. 100 gr. of this air contain 8,48 gr. of phlogijton and 
91,52 of acict. 
OF THE QUANTITY OF PHLOGISTON 
IN SULPHUR. 
This I endeavoured to find by eftimating the quantity of 
fixed air produced during its combuftion. 
To the top of a glafs bell, which was open, I firmly tied 
and cemented a large bladder, defhned to receive the air ex- 
panded by combuftion, a quantity of which generally efcapes 
when this precaution is not afed. Under this bell, which con- 
tained about 30°° cubic inches of air, I placed a candle ot ful- 
phur, weighing 347 §r. » its wick (which was not con Turned^ 
weighed half a grain : it was fupported by a very thin concave 
plate of tin, to prevent the fulphur from flowing over during 
the combuftion, and both were fupported by an iron wire, 
fixed on a fhelf in a tub of water. As foon as the lulphur was 
fired with a very feeble flame, it was covered with the bell, the 
air being fqueezed out of the bladder. The infide of the bell 
was foon filled with white fumes, fo that the flame could not 
be feen. In an hour after, the fumes thoroughly fubfided, and 
all w r as cold. The water rofe within the bell to a height equal 
to 87,2 cubic inches; whence I deduce that 87,2 cubic inches 
of fixed air were produced, which contain 7,287 gr. of phlo- 
gifton, which feparated from the vitriolic acid, and united to 
the dephlogifticated part of the common air under the bell. 
Vol. LXXI 1 . u h . The 
