C»>4] 
Aat it appears, thtt the prefliire in this experiment was not 
auite (b gi'eat vpun the Air as vpon the water: I haue there* 
fore thought ot another way, which I think better, to come 
to the &id Knowledge; and I do hunibiy fubmit it to the 
R. Society. 
My way is grounded vpon this HjdrcfiatUd PrincifU. 
that liquors hatte afirengtk to ajcend as i4gh as tioeir fount //; and 
although the rehltence of tiic A/e-^/W/ dotli always hinder 
hds (Ceau in the open Air from reachmg quice lb high, neuer- 
thelefs the liquor at its firft fpoutmg out^ hath the nec^itiry 
fwiftxieis to come to that height. 
Propofftim. L 
From this Principle may eafilv be deduced this Propofiti* 
on, that of two diftcring liquor s driven by the fame pret 
lure, that which is /V? fpecie lighter muft afccnd higher than 
that which is hcauier, and their heigths will be reciprocally 
in the lame reafon their fpccifick gravity's arc. Thus, 
Quickfiluer being 1 5 times and a half hcauier than water, 
bears as much prcffurq when its fpring is one fiDOt aboue the 
fpout hole, as water doth when it's Ipring is ; } foot and 
a half high, and the heigth to which Mercury fliall alcend 
will be ^ I times and a half leiler than the heigth to whicfa^ 
water fhall be driven by thofe equall preffures. 
Tvopcfition. II. 
' From the foregoing Propofition another may eafily be 
deduced, i />, 1 hat of difftring liqiiors bareing the fame pref 
fure thofe that are lighter in Jfecie muft acquire a greatCf 
fwittntfi, and theii diflering Velocity's aie to one another 
as the roots of the fppcifick Grauity's of the fayd hquor*» 
For we haue {tm/l rop. r . that the heigth's to bcattain'd 
arc in the fame realbn as the fpccifick erauity^iNow GWi- 
i4us y HfiiiMiHsj^ikdothi^ts haue demonfti ated that the Veto** 
citiei 
