taste that
Pyrmont water has. The readiest way of impregnating water with this
virtue, in these circumstances, is to take two vessels, and to keep
pouring the water from one into the other, when they are both of them
held as near the yeast as possible; for by this means a great quantity
of surface is exposed to the air, and the surface is also continually
changing. In this manner, I have sometimes, in the space of two or three
minutes, made a glass of exceedingly pleasant sparkling water, which
could hardly be distinguished from very good Pyrmont, or rather Seltzer
water.

But the _most effectual_ way of impregnating water with fixed air is to
put the vessels which contain the water into glass jars, filled with
the purest fixed air made by the solution of chalk in diluted oil of
vitriol, standing in quicksilver. In this manner I have, in about two
days, made a quantity of water to imbibe more than an equal bulk of
fixed air, so that, according to Dr. Brownrigg's experiments, it must
have been much stronger than the best imported Pyrmont; for though he
made his experiments at the spring-head, he never found that it
contained quite so much as half its bulk of this air. If a sufficient
quantity of quicksilver cannot be procured, _oil_ may be used with
sufficient advantage, for this purpose, as it imbibes the fixed air very
slowly. Fixed air may be kept in vessels standing in water for a long
time, if they be separated by a partition of oil, about half an inch
thick. Pyrmont water made in these circumstances, is little or nothing
inferior to that which has stood in quicksilver.

The _readiest_ method of preparing this water for use is to agitate it
strongly with a large surface exposed to the fixed air. By this means
more than an equal bulk of air may be communicated to a large quantity
of water in the space of a few minutes. But since agitation promotes the
dissipation of fixed air from water, it cannot be made to imbibe so
great a quantity in this method as in the former, where more time is
taken.

Easy directions for impregnating water with fixed air I have published
in a small pamphlet, designed originally for the use of seamen in long
voyages, on the presumption that it might be of use for preventing or
curing the sea scurvy, equally with wort, which was recommended by Dr.
Macbride for this purpose, on no other account than its property of
generating fixed air, by its fermentation in the stomach.

Water thus impre