[ i6z ] 
was then introduced into the cylindrical glafs, by 
pouring fome rain water into the veftel of quickfilver, 
and then lifting up the cylindrical glafs fo as to raife 
the bottom of it a little way out of the quickfilver. 
After having differed it to ftand a day or two, in 
which time the water feemed to have abforbed as 
much fixed air as it was able to do, the divifion 
anfwering to the upper furface of the water, and alfo 
that anfwering to the furface of the quickfilver, were 
obferved: by which it was known how much air 
remained not abforbed, and alfo how much water 
had been introduced : the divifion anfwering to the 
furface of the water telling how much air remained 
not abforbed, and the difference of the two divifions 
telling how much water had been let up. More 
water was then let up in the fame manner, at different 
times, till almofl the whole of the fixed air was ab- 
forbed. As all water contains a little air, the water 
ufed in this experiment was firft well purged of it by 
boiling, and then introduced into the cylinder while 
hot. The refult of the experiment is given in the 
following table j in which the firft column fhews the 
bulk of the water let up each time ; the fecond fhews 
the bulk of air abforbed each time; the third the 
whole bulk of water letup; the fourth the whole 
bulk of air abforbed ; and the fifth column fhews the 
bulk of air remaining not abforbed. In order to fet 
the refult in a clearer light, the whole bulk of air 
introduced into the cylinder is called i,and the other 
quantities fet down in decimals thereof. 
hulk 
