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Incumbent on the Mercury, for then I manifestly perceived, and shewed toothers, that the Surface- of the Quick. Silvcr beingiDepressed almost to a Levelin thole Parts of it that were near the inside of the Glase, there was aboutthe Middle of the Surface an Elevatipn of Mcrcurial Matter, that appeared-tobe rather more than a half Globe, and was to the Height of its füll Semi-diameter, raisod above the rest of the Mcrcurial Surface, and in that State itcontinued as long as I thought fit to let it do lb. And lest this Tryal shouldImpose upon me, I caused it to be more than once Repeatcd ; and, the bes-ter to conhrm it, I afterwards caused the Incumbent Watcr to be Little by Littlelückt up, and found, as I expected, that when the- Incumbent Water beganto be too much fhortn’d, the little Teat or Segment of a Sphere lately men-tioned, began to be somewhat Flattened, and Subsided more and more as theTVater was further taken oft'.

e>. Having conveyed into one of our Pneumatical J{cccivcrs, a Couple ofsuch llender Pipes as have been already delcribed, one of them Furnifhedwith Common H'atcr, and the other with Quick. Silvcr, we caused the CommonAir to be diligently Pump’d out, without observing any Sensible Change inthe Concave Figure of the H üter ■. But as for the Quick. Silvcr, I knew notwhat to Conclude about it. For having Repeated the Tryal twice or thrice,the Mercury lometimes secm’d manifestly to Swell, to be more Protuberant up-on the Exhaustation of the Pcccivcr, than when it was put in, especially whenits Figure was attentively Viewed, and the External Air that was Pumpt outbut stowly, was liiffered to Re-enter with all convenient Celerity. But thatwhich yet kept me doubtful, was, that I observed, That upon the diligentwithdrawing oi the Airs Pressure upon the Quick. Silvcr, there diselosed them-selves some little Bubbkrs, which, 1 fear’d, we had not been able to free it al-together from, and which rnight be sospected to have Ibme lotetest in thePhänomenen. We also convcy’d into our Rjcciver , a clear Chymie al Oil that'was heavier than Watcr, and whilst it was Contiguous to it, had not a Con-cave but a Convex Surlace, and having placed the Pipe furnilh’d with bothLiquors in the Pneumatical Rcccivcr, we Pumpt out the Air without findingthat the Oil fensibly altered its Protuberant Surface, as neither did the Waterlose the Concave Figure of it’s upper Surface.

io. I tpok Fixt Hitrc, (or which is Analogous to it, Sah of Partar) re-sblved per ^Deliquium into a Transparent Liquor, and having filled a clear Vialhalf füll with this, I poured on it a convenient quantity of Vinous Spirit ex-actly PcBificd, that there might be no Phlegm to occasion an Union betwixtthe two Liquors, which ought as ours did, to retain Distinct Surfaces, andIpeediLy regain them though the Glasi were well {haken. Then having foundby a Tryal formerly mentioned, that Common Oil of Turpent ine, if employedin a Competent Quantity, will not totally (and much lels will readily) Difsolve in Spirit of H r inc, and also having Observed (what may leern somewhatstränge) that if this Spirit of H r ine be exquisitely Dephlegm’d, the Oil, thougha Chemical One, will not Swim on it, but Sink in it; 1 warily let fall somedrops of the Oil into the Spirit, and had the pleasure to ice, as I expected,that they feil towards the bottom of the Glafs till their Desoent was stopt by

the

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