APPENDIX. 273 
of that Ail* is returning at the fame time from 
an elaftic to a fixed State : And to find ouc 
whether it was Co or no, it was necefiary to 
feparate in this manner, a Proportion of this 
Air from the Ale, which by continually fend- 
ing up frefli Supplies of Air, made it difficult 
otherwife to diftinguifli whether it were fo or 
no. 
.3. From this Experiment on Ale we fee 
the Reafon why many of thofe fermenting 
Mixtures mentioned in I. C^ap, VL were 
found to be fometimes in a generating and 
fometimes in an abforbing State, v/z, becaufe 
fometimestheygenerated more than they reforb- 
cd, and then they appeared to be in a gene- 
rating State ; and fometimes, efpecially on a 
Change from a warmer to cooler State, they 
then appeared to be in a reforbing State, not 
that their reforbing Power was greater in the 
cooler State, but becaufe little frcfli Air was 
then generated, and part of what was before 
generated, was continually lofing its Elaf- 
. ticity. 
4. By feveral other the like Experiments I 
found that all the Air of fermenting Malj. 
Drink did not lofe its Elafticity, nor was re, 
forbed by the Water, and that, whether I 
T ufed 
