( 8po ) 
Figure in the Viol I was fain to make ufe of: and I fufpcfljed, 
that the Oil grown confiftenc was become lefs convex than be- 
fore; but the two fnrfaces of it gave it forae refcmblancc in 
point of flhape,but; not of trgufpzrmcy ,10 ^ Coficayp- Convex 
Gla(l ; but yet much thicker in the middle than is ufiial in Gjaf- 
Tes of the like breadth, employed for Dioptrical Pf^rpofis. And 
indeed (to give here this AdvertiftmeDt once for all) 1 would 
Hoc have you underftand in too ftndt afenfe, what my intended 
brevity, and forae other Motives, make me deliver in naming 
the Figures of Fkids. For I confcfs, that if 1 were to write 
for a rigid Geometrician^ efpccially if he were nice and critical 
in the Doflrine oiConic Se0iom^ \ fliould think my felf obliged 
on fome occafions to a greater Curiofity in naming the Figures 
of Fluids^ thanyou will meet with in this Taper: Butfince I 
write but Notes, and defign to give you rather Experimental 
hints, than G^t^w^^f/r^/ Determinations, I prefume, that when 
you are once cautioned by a plain Advertifement,it may.fuffice 
for me to refer the Fb^dsJ dercrihe,to fuchof the more known 
i%»r^/asthey fcemed to beihe leaft remote from, without 
troubling you or my felf with maimM Figures, or with Spbe- 
roidSfQnoidSiParaMoidsy and other hard words ; which I the 
ratherabftain from , not only becaufe the Particulars, wherein 
my Fluids refembled them and differ*(^* from thtm , could not 
be intelligibly declared without many words ; but becaufe I 
obferved the Figures themfclvcs of the Fluids to vary , and 
fometimesconfiderably too, according to Contingent circum- 
ftances. And for this Reafonalfo I will not perfwadeyou to 
expeft, that the event of every Trial, you fhall make of thefe 
Experiments, will be precifely the fame wiih the event of 
mine. For by reafon of thofecontingcnt Circumftances, I dajre 
only fpeak Hiftorically of thiefe Experiments, and, without 
pretending that they fliall always uniformly fucceed, content 
my felf to relate hpa fide , whcjt Trials have been tirade, and 
what happened to me thereuppn, not defpairingjthai this vari- 
ation it felf of Events accordinjgito Cir.cj|jmllanccsi3i^a3D be 
flruftive. , ;oft ?bvv loi V 3{h .^rrob t^h-ci 
But to return to ouy lately mentioned Oil of Annifkeds^'tms 
worth obferving,. how great a4lffejrem?evtfeere wa^ betA^^ecn the 
«)«11 refle^ipn it m^e when 'tv^ras Go«gi^te4,^nd tit Aie re- 
Refle&ioflf 
