indeed thit very Cornet^ which he faw with his naked* Eye , and 
obferred with his Geometrical Inftruraents, the faid 12, 13, and 
14. dayes of FebrHArj \ or whether it was another, and whether he 
had loft' that Comet , which moved towards the Stcond Star Kn Aries :: 
but leaves it to the Learned World, and particularly to the Royal So- 
ciety, after they fhall have well examined and confidcred all his Obfcr- 
vations, and the Calcu Ins raifcd therefrom^, to judg-e of this, and. 
the other particulars in controverfie^ 
Ih IfaacHs VoffiHS de M I L I et ALIORVM F LV^ 
MINUM ORIGIN Ic wa« Nhmb. 1 4 . of thefe Tranf- 
Actions , that gave an account of the ' Caufe of the Inundation of thi Nile^ 
as it was rendrcd by Monfieur dg U Chxmhe : This is to giveyoa 
another, not only of thcJnmdmm^ butalfoof the Origins of that, 
and of other Rivers ^ as it is delivered by Monfisur IJaac VsJ^usy 
who undertakes in this Book to fliew 5 
1. That thofe Subterranestts Channels , through which fevera!; 
Fhilofophers teach ^ that the Sea difcharges it fclf into the Rivers, 
arc not only imaginary^ butufelefs, inregardr'tis impofsible for thc; 
water to rife from the Subterraneous places up to the Mountains , wher^ 
toramonly the Sources of Rivers are, 
2. He explicates , why , if a Pipe be put into a Bafon full of Wa^ 
ter, the water is fecn more raifed in the Pipe , than in the Ba- 
fon , and fifes higher according as the Pipe is narrower - On the 
icontrary, if the fasae Pipe be put into a Bafon full of Qgickfilverj., 
the Quickfiiver (lay es lower in the Pipe , than in the Bafpn. The 
reafon , which" he renders hereof, is , That as the Water fticks ca- 
fily to alleit touches , it is fuftain'd by the fides of the narrow Pipe 
wherein it is included i And indeed, if the pipe be qiiite draw0 ouc 
of the Water, the Water doth not all fall out, but fo much of h 
remains, as the fides of the Pipe could iuftaiae: Whence it is, that 
the Water which is kept op by the Walls of the Tube , weighing ■ 
no longer upon that. which is in the Bafon, is thruft upwards, aadi 
keeps it fclf raifed ali^ve. its Levcll ^ but the Qui(;kfilver not ad- 
hering fo eafily, as Warer, to Bodies it touches , is not fuftainedby 
the fides of the Tube; and fo mounts not above its Lcvell , buc 
rather dcfcends below 11^ , becaufe the pipe, which is ftreight, hin^ 
ders the endeavor that is in the Mirenrj to rife to its LcveU Hc: 
adds , that this Obfervation makes nothing for the Explication of 
tkc Origim of Rivm% h^^vaS&^ chough it be trae, that the Water 
