on the fpecific Gravities, See. of Saline Subjlances . zy y 
fequent chemifts who made the experiment with more care 
concluded from it, that fulphur contained one- feventh of phlo- 
giftotl. EXLEBEN, § 760. 
By weighing flowers of fulphur in a perforated brafs box in 
water, I found its fpecific gravity to be 1,924. It remained in 
the water a quarter of an hour before any air iffued from it, 
and then fome bubbles arofe ; but when I opened the box, I 
found the middle part of the flowers quite dry, fo that I 
make no doubt but fome air hill remained, and that its fpecific 
gravity is ftill greater. Mr. petit weighed it in oil, and 
found its fpecific gravity 2,344, which I believe to be nearly 
the truth. 
OF THE QUANTITY OF PHLOGISTON IN 
MARINE ACID AIR. 
8 gr. of copper diflolved in colon rlefs fpirit of fait afforded 
but 4,9 cubic inches of air, when the air was received over 
water, and this air was inflammable. 
8,5 gr. of copper being diflolved in the fame quantity of the 
fame fpirit of fait, and the air received over mercury, afforded 
91,28 cubic inches of air; but of thefe only 4,9 cubic inches 
were inflammable air; the remainder, therefore, viz. 86,38 
were marine air, which weigh 56,49 gr. 
Now, as fpirit of fait certainly does not dephlogifticate cop- 
per more than the vitriolic acid does, it follows, that thefe 
4,9 cubic inches of inflammable air, and 86,38 cubic inches 
of marine air, do not contain more phlogifton than would be 
feparated from the fame quantity of copper by the vitriolic 
acid : and fince 1 00 grains of copper would yield to the vitriolic 
H h 2 acid 
1 
