C 99 1 
abforbed it made a precipitate with lime-water. But, 
in order to abforb all the fixed air more perfectly, the 
air which remained not abforbed was transferred into 
another bottle of water, in the manner defcribed in 
my firft paper on factitious air, page 142 of the pre- 
ceding volume. This bottle was then fet with its 
mouth immerfed in a bottle of fope-Ieys ; after which, 
by fhaking the bottle, the fope-leys was mixed with 
the included water; whereby the air in the bottle was 
brought in contact with the fope-leys, which is well 
known to abforb fixed air very readily. By this 
means the air was reduced to 84 ounce meafures. A 
fmall vial being filled with equal quantities of this and 
inflammable air, and a piece of lighted paper applied 
to its mouth, it went off with as loud a bounce, as 
when the fame vial was filled with equal quantities of 
common air and inflammable air. The fpecific gravity 
of the remainder was tried by a bladder, in the manner 
defcribed in the above-mentioned paper ; as well as 
could be judged from fo fmall a quantity, it wasjufl 
the fame as that of common air. From thefe two 
circumftances, I think we may fairly conclude that this 
unabforbed part was intirely common air; confequently 
the air difcharged from the Rathbone-place water 
confided of 84 ounces of common air and about 66 
of fixed air. The air which was difcharged before 
the water began to boil contained much more com- 
mon air, than that which was difcharged afterwards ; 
that which was difcharged towards the latter end 
feeming to contain fcarce any but fixed air. 
As fo much fixed air is difcharged from this water 
by boiling, it feemed reafonable to fuppofe, that the 
diftilled water fhould contain fixed air. I accordingly 
found it to make a precipitate with lime-water. 
O 2 Expe- 
