C *55 3 
AvaS abforbed as ufu'al. I then took a quantity of 
ftrcng artificial Pyrmont water, and, putting it into 
a thin glafs phial, I fet it in a pot that was filled 
with fnow and fair. This mixture inflan tly freezing 
the water that was contiguous to the fides of the 
glafs, the. air was difcharged plentifully, fo that I 
catched a confiderable quantity, in a bladder tied to 
the mouth of the phial. 1 alfo took two quantities 
of the fame Pyrmont water, and placed one of 
them where it might freeze, keeping the other, in 
a cold place, but where it would not freeze. This 
retained its acidulous tafle, though the phial which 
contained it was not corked *, whereas the other, 
being brought into the fame place, where the ice 
melted very flowly, had at the fame time the tafte of 
common water only. That quantity of water 
which had been frozen by the mixture of fnow and 
fait, was almoffc as much like fnow as ice, fuch a 
quantity of air bubbles were contained in it, by 
which it was prodigioufly increafed in bulk. 
The preflure of the atmofphere afiifts very con- 
fiderably in keeping fixed air confined in water ; for 
in an exhaufted receiver, Pyrmont water will abfo- 
lutely boil, by the copious discharge of its air. This 
is alfo the reafon why beer and ale froth fo much in 
vacuo. I do not doubt, therefore, but that, by the 
help of a condenfing engine, water might be much 
more highly impregnated with the virtues of the 
Pyrmont fpring, and it would not be difficult to 
contrive a method of doing it. 
The manner in which I made feveral experiments 
to afcertain the abforption of fixed air by different 
fluid fubflances was to put the liquid into a tfifli, 
X 2 and 
