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 downwards, by which Means the AETHER is prevented, by the interposition of the Water, from evaporating.

The Publisher has also appointed it to be sold by Mr. R.  Board, Chemist and Druggist, in Grace-church-street; and Mr. J.  Wilkie, Bookseller, at the Bible in St. Paul’s Churchyard, LONDON:  and Mr. Peter Wilson, Bookseller, in Dame-street, DUBLIN.