(ball not now difcourfeof that Subjefi, nor fo mtch as mention 
what 1 have tried about it ; but ftall rather takenotice>rhar, 
becaufe I fufpeded, th^t the Concave Figure, which ma>' be 
obferved in thefurfaceof Water included in (lender pipes^ 
may, at leaft in great part, depend upon its relation to the 
Contiguous fluid, whlcb,kn ordinary cafes, is the Air j 
I thought fit to try whether this Concave Figure Exp.L 
would not be altered by fubftituting another Liquor 
in the room of the Air : And accordingly having procured a 
Arougly A kalizat Me/^Jlr mm (I ufed that madeof fixe N^icer, 
diffolved by the moifture of a Cellar) into a p?peof glafs, 
feai'd at one end, and not full a quarter of an Inch in bore ; 
that the Cavity, which in a greater breadth would feem !efs 
deep,niight be the more confpicuous : We gently poured on it 
fome highly dephlegoi'd Spirit of Wine, which we knew would 
not mix with ir^ but fwiui above it, and prefently , as we had 
guefs'd, we found the Figure of thefurfaceof the lower Li* 
quor changed, andthecavity quftedeftroyed; the furface that 
feenaed, as it were, common to the two contiguous Liquors, 
appearing flat or horizontal. And fuch a level Superficies we 
bad, by patting thofetwo Liquors together in a much wider 
Glafs. 
We^ found alfo, t hat by employing Oyl cf lurfentine Exp.n. 
infteadof Spirit of Wine, the Liquor did almofl: totally loft 
its Cavity. 
But if, indeadof deliquated Tartar, we put com- Exp.iiL 
mon water into the Pipe, we found this Liquor to 
retain its Concave Surface, though we put to it fomeOylof 
Turpentine and left it to refl: upon the water a good while. 
In regard that, when Oil and Water are put together , the 
Oil that has been employed to produce the J^h£ftoMe»a , wont 
to be afforded by their eonfaft , has ufually been common Oil , 
as that of Olives , which is lighter than water; I thought it 
expedient to try what Figures would be afforded by the 
Surface of water and alfo by that of Air, when thofe Flu- 
ids (hould become contiguous to an Oil, heavier than water: 
of which fort Ghymiftry had afforded rac more than one or 
two befides the Effential oils of Cloves and Cina- 
mon : Having therefore provided fome pure oil of the ExpJ V, 
Gum of GuajiCHm^ and poured a little of it into a 
5 I 2 flendesT 
