ccording to the management of
some Part of the Process. Wetting the Finger with it, or dropping
a little upon the Hand, it vanishes instantly, and leaves no
Moisture behind; so that the Part scarcely seems to have been wet.
Half a Dozen Drops, dropped together upon a Table will disappear
in a few Seconds of a Minute, and leave only the Appearance of a
large oily Ring behind; but if it leaves the least Watery or
Spirituous Moisture, or does not evaporate in much less than a
Minute, it is not good. The best AETHER will dissolve in, or mix
with, a certain Quantity of Water; and that is the best which
requires the largest Quantity of Water to dissolve it: If,
therefore, to fix Tea Spoonsful of Water in a small Phial, you add
one of the AETHER to be examined, cork up the Phial, and shake
them very well together, and upon standing a little while some
part of the AETHER appears at Top, in form of Oil, sufficient to
cover the surface of the Mixture, it may be pronounced good
(provided it also answers, in the other Methods of Trial) and the
more appears the better is the AETHER; but if none appears, or not
enough to cover the surface of the Mixture, it was either
adulterated, or not well rectified. If to this Mixture of AETHER
and Water you add a little _Salt of Tartar_, and any Fermentation
ensues, the AETHER was not well rectified. Upon shaking briskly a
Phial containing AETHER, if the Bubbles, or Proof as they are
usually called, do not disappear in less Time, and in larger
Bubbles, than any other Liquor, (the Vinous Alcohol perhaps
excepted) 'tis not Genuine.

It is the more necessary to observe these Rules of proving the
Quality of the AETHER, as the imperfect Sorts have been found to
disagree with the Stomach, and produce other bad Effects, besides
disappointing the Patient's Expectation. The AETHER that has the
foremention'd Properties, (for there are Preparations sold by the
same name, which are very imperfect Imitations of it) is made and
sold by M. TURNER, Surgeon, in _Liverpool_. The Ounce Phial _two
Shillings_; the Half Ounce _one Shilling_. The Phials are square;
the Word AETHER, inscribed on one Side, and M. TURNER on the
opposite, and sealed with a Lion gardant, &c. Proper Abatement
will be made to Druggists, Apothecaries, or the Gentlemen of the
Faculty who use any considerable Quantity. To prevent it's escape
and loss, a small Quantity of Water is put into each Phial, which
should be kept with the Cork downwa