[ l6 3 j 
Bulk of air let up ~i. 
B ulk ofvvate. 
Bulk of air ! 
Whole bulk 
Whole bulk 
Whole bulk 
let up each 
abforbed 
of water 
of air 
of air 
time. 
each time. 
let up. 
abforbed. 
remaining. 
• 3 22 
•374 
.322 
•374 
.626 
.481 
.485 
.803 
•859 
.141 
.082 
.048 
.885 
• 9°7 
.O93 
•H 5 
.079 
1.03° 
.986 
.OI4 
I imagine that the quantities of water let up and 
of theairabforbed could be eftimated to about three or 
four ioooth parts of the whole bulk of air introduced. 
The height of the thermometer, during the trial of 
this experiment, was at a medium 55 0 . 
This experiment was tried once before. The refult 
agreed pretty nearly with this; but, as it was not tried 
fo carefully, the refult is not fet down. 
It appears from hence, that the fixed air contained 
in marble confifts of fubftances of different natures, 
part of it being more foluble in water than the reft : 
it appears too, that water, when the thermometer is 
about 55 0 , will abforb rather more than an equal bulk 
of the more foluble part of this air. 
It appears, from an experiment which will be men- 
tioned hereafter, that water abforbs more fixed air in 
cold weather than warm ; and, from the following 
experiment, it appears, that water heated to the boil- 
ing point is fo far from abforbing air, that it parts with 
what it has already abforbed. 
Experi- 
