), then you may put in the Salt by little and
little. For, keeping a long Weather-glass for a good while in our
impregnated Mixture, I often purposely try'd, that, when the tincted liquor
subsided but slowly, or was at a stand, by putting in, from time to time, 2
or 3. spoonfuls of fresh Salt, and stirring the Water to quicken the
Dissolution, the Spirit of Wine would begin again to descend, if it were at
a stand or rising, or subside much more swiftly than it did before. And if
you would lengthen the Experiment, it may not be amiss, that part of the
Sal Armoniack be but grosly beaten, that it may be the longer in
dissolving, and consequently in Cooling the Water. Whilst there are dewy
drops produced on the outside of the Vessel, 'tis a sign, that the Cold
within continues pretty strong; for when it ceases, these drops especially
in warm weather, will by degrees vanish. But a _surer_ way of measuring the
duration of the Cold, is, by removing from time to time the Seal'd
Weather-glass out of the Saline Mixture into the same common Water, with
part of which it was made. And though it be not easie to determin any thing
particularly about this matter; yet it may somewhat assist you in your
Estimates, to be inform'd, That I have in the Spring by a good
Weather-glass found a sensible adventitious Cold made by a pound of Sal
Armoniack at the utmost, to last about 2 or 3 hours.

3. To cool Drinks with this Mixture, you may put them in _thin_ Glasses,
the thinner the better; which (their orifices being stopp'd, and still kept
above the Mixture) may be moved to and fro in it, and then be immediately
pour'd out to be drunk: Though when in the Glass, I imployed, was
conveniently shap'd as, like a Sugar-loaf, or with a long Neck, I found it
not amiss to drink it out of that, without pouring it into any other; which
can scarce be done without lessning the Coolness. The refrigeration, if the
Glass viall be convenient, is quickly perform'd: And if one have a mind to
cool his hands, he may readily do it by applying them to the outside of the
Vessel, that contains the refrigerating Mixture; by whose help, pieces of
Chrystal, or Bullet for the cooling of {259} the Mouths or Hands of those
patients, to whom it may be allow'd, may be potently cool'd, and other such
refreshments may be easily procur'd.

4. How far Sal Armoniack, mingl'd with Sand or Earth, and not dissolv'd,
but only moistn'd with a little Water sprinkl'd on it, will keep Bot