EXPERIMENT XXIX.
* 1.1TO shew, whether the Ascent of Fumes and Vapours, was rather promoted by the Am∣bient Pressure of the Air, than that their Ascent depended on their own Positive Lightness; I conveigh'd a Certain Liquor which I had for∣merly made for other Purposes, into our Re∣ceiver; it consisting of Metalline Ingredients, which upon Unstopping of the Bottle, would emit copious Steams, like the Powder of Ala∣blaster; but upon stopping of it again, the Up∣per Part of the Bottle, as well as the Liquor, be∣came Transparent; and this Liquor being con∣veigh'd into our Receiver, with a Weight affix'd to the bottom of the Viol, to keep it from ris∣ing up, when the Cork was pull'd out, we ty'd a String to the Cork, and the other End to the Receiver; and having clos'd it up, and pump'd out the Air, we screw'd the Cork out of the Bottle, and observ'd, that tho' some Parts of the Air included in the Bottle, rais'd a few; yet the Fumes did not rise as when expos'd to the open Air, but lifting up themselves by their own Agi∣tation, rose to the Top of the Viol, and no higher, but ran down the outside of the Glass in Streams; which continued till the Ingress of Air was permitted to put a stop to that Phaenomenon; but as soon as the Bottle was taken out into the