18 
MrcrROGRAPHIA, 
the motion #pwards, the fide.4 will be depreft to E, and therefore ¢ bein 
thruft to etd D to H; the globular Figure by this means cio alte 
made an Eljiptico-fpherical. Next if a fluid be included partly with one, 
and partly with another fluid, it will be found tobe fhaped diverfly, ace 
cording to the proportion of the gravity and incongruity of the 3 flnids 
one to another : As in the fecond Figure, let the upper 44 4444 be Air,the 
middle L 44.N 0 becommon0y/, the lower 0 0 O be Water, the Oyl 
will be form’d, not intoa /pherical Figure , fuchas isreprefented bythe 
pricked Line, but into fuchaFigureas LM N O, whole fide’ L MN ~ 
will be of a flatter Eliiptical Figure, by reafon of the great difproportion 
between the Gravity of Oyl and Air, and thefide L O M of arounder, 
becaufe of the fmaller difference between the weight of Oy/and. Water, — 
Laftly, The globular Figure will be changed,if the ambient be partly fuid 
and partly joid. Andhere the termination of the incompafied fivid to- 
wards the incompafling is fhap'd according to the proportion of the-con- 
gruity or incongruity of the fixids to the folids , and of the gravity-and 
incongruity of the fi#ids one to another. Asfuppofe the fubjacent me- _ 
dium that hinders an included fluids defcent,be a folid , aslet K I, inthe 
fourth Figure, reprefent the {mooth fuperficies of a Table; E GF Ha — 
parcel of running Mercury; the fide G F H will bemore flatted, ace 
cording tothe proportion of the incongruity of the Aéercury and Air to — 
the Wood,and of the gravity of Mercury and Air one toanother 3 The fide 
G E H will likewife be a little more depreft by reafon the fubjacent — 
parts are nowat reft,which were beforein motion. 3 Ma 
Or further in the third Figure, let A 1 L 1D reprefent anincluding fo- 
id medium of a cylindrical fhape (as fuppofe a {mall Glafs ar) Let — 
F GE M Mreprefent a contain d fiwid, as water; this towards the bot- _ 
tom and fides, is figured according to the concavity of theGlafs: Butits — 
upper Surface, ( whichby reafon of its gravity, Achaia atall — 
the Air above it, and fo neither the congruity or incongruity of either of — 
them tothe Glafs ) fhould be terminated by part of a Sphere whofedia- — 
meter fhould be the fame with that of the earth, which to our fenfe would 
appear a {traight Live,asF G E, Or which by reafon of.its havinga — 
greater. congruity to Glafs than Air has, ( not confidering its Gravity) _ 
would: be thruft into a concave Sphere, asC H B, whofe diameter would 
bethe fame with that of the concavity of the Veflel:_) Its upper Surface, _ 
I fay, by reafon of its having agreater gravity thenthe Air, and having _ 
likewife a greater congruity to Glafsthen the Air has, is terminated, bya — 
concave Eliptico.pherseal Figure, as C K B. Forby its congruity it eafily — 
conforms it fel, and.adheres to. the Glafs, and conftitutes as it-were one 
containing body with it, and therefore fhould thruft the contained Airon 
that fide it touches it,into a {pherical Figure, asB H C, .but the motionof — 
Gravity Semele little the Corners B and G, reducesit into the afore- — 
faid Figure C KB. . Now that.itisthe greater congruity/of one ofthe — 
two contiguous fivids,then of the other,to the containing folid,that caules — 
the feparating furfacesto be. thus or'thus figured); And that itis not ber 
caufe this or that figurated furface is more proper, natural, ori peculiar'to 
Sai one — 
