( 78f ) 
bably willbe thought Chimerical, I fliaii only add, which I 
forgot before^that we conveyed into our Receiver a clear Chy- 
niical Oil that was heavier than Water , and, whilft 'twas con- 
tiguous to it, had not a Concave but a Convex furface, and 
having placed the Pipe furnifli'd with both Liquors in the 
PneumMCAl Receiver , we pumptout the Air without finding 
that the Oil fenfibly altered its Protuberant Surface ^ as neither 
did the Water lofe the Concave figure of its upper fur- 
face* 
When Clouds arc condensed into R ain, and lower aggregates 
of vapors into Dew, Yis fuppofed to be obvious, that the 
drops of thofc Meteors do, in their palTage through the Air, 
f which to them is a heterogeneous Fluid ) acquire a round 
figure; and when we fliake Oil into Water, the portions of the 
former fluid, during the little time they remain diftinft (for 
they quickly reunite into mafles) are found to be globular. 
'QiXttht^QPh^mmem diXtiQo few and too tranfient to afford 
any confiderable Obfer vation of the Figures of Fluid bodies, 
efpecially if they be quiefcent, and every way encompafs'd 
by other Fluids. Wherefore I thotigbc fit to try what I 
could do with Chymical Liquors unapt for mingling, to 
^xodnct Pbmomena.t\\d.t may lad long enough to allow Us 
to obferve them attentively, and in fome cafes to vary 
them* 
For this purpofe , I firft took fint Niter ^ (or, which is 
analogous to it, Salt of larfar ) refolved perDe* Esp.3C« 
liqmummo^ tranfparellt Liquor, and having fill'd 
a clear Vial half full with this, I poured on it a convenient 
quantity' of Vinous fpiritexaaiyreflified, that there might be 
no Phlegm to occafion an union between the two Liquors, 
which ought, as ours did, to retain diftinft furfaceSyZXxd fpee- 
dily regain them though the Glafs were well flbaken* Then 
having found by a Trial formerly mention'd, that common 
OAof Turpentine /\f employed in a competent quantity, will^ 
not totally (and much lefs will readily) diffblve in Spirit of 
Wine , and alfo having obferv'd (what may fecm fomevvhat 
ftrange) that if this Spirit of Wine beexquificely dephlegm'di 
the Oil, though a Chymical one^ will not fwim on it , but fink 
in it 5' I warily let fall fome drops of the Oil into the Spirir, 
