fingers inside the bladder until the water
has flowed out of the bottle into the bladder, and the air has mounted
out of the bladder into the bottle; I then put in the cork and detach
the bladder from the bottle. When I wish to preserve the air for a long
time I place the neck of the bottle in a vessel with water. (_f._) When
there is aerial acid in the bladder, or another air which can unite with
water, and I wish to unite it with water neatly, I fill a bottle with
cold water, and, after it has been attached to the bladder, I permit
about the fourth part to run into the bladder; I then push the cork,
which, as previously, was firmly held within the bladder, into the
bottle again; I then shake the bottle gently, when the air will dissolve
in the water. Thereupon I make a small opening by means of the cork,
when air passes out of the bladder into the bottle in order to fill up
again the space which has become empty, without any water running into
the bladder; I then push the cork again into the bottle and shake the
water contained in it. I repeat this operation two or three times more,
when the water is saturated with this air. (_g._) When I wish to mix
together two kinds of air in a flask or bottle, I permit in the first
place just as much water, by measure, to run from the bottle filled with
water, into the bladder, as I wish to have of air. I then tie the bottle
over with a bladder filled with another kind of air and permit the
remaining water to run into the bladder, whereupon I immediately replace
the cork in the bottle, as soon as the last of the water has run out.
(_h._) When I wish to have in a bladder an air collected in a bottle, I
reverse the operation. That is to say, I fill the bladder with as much
water as I wish to have in it of air and tie it up at the top; I then
tie this bladder tightly over the top of the bottle and untie the
ligature of the bladder, draw the cork out of the bottle and so permit
the water to run out of the bladder into the bottle. I then tie up the
bladder, which now contains the air out of the bottle, and detach it
from the bottle. (_i._) When I have in a bottle an air mixed with
another kind of air which can be absorbed by water or lime, but wish to
know how much of each kind is present in the bottle, I tie over it a
bladder into which so much milk of lime has been poured that the bottle
can be filled with it; I then withdraw the cork and permit the water or
milk of lime to run into th