(175) 
6. If a Body be placed under Water, with its uppcrmoft Surface 
parallel to the Horizon 5 how much Water foever there may be 
on this or that fide above the Body ^ the dired: prefllire fufteined 
by the Body (for we now confider not the Lateral nor the Recoy- 
lingpreffiire,to which the Body may be expofedj if quite environ- 
ed with V/ater)is no more^than that of a Column of water.having 
the Horizontal Superficies of the Body for its Bafis, and the Per- 
pendicular depth of the Water for its height. 
And fo hkewife^ 
If the Water^- that leans upon the Body, be contained in Pipes- 
open at both ends -the preiTure of the Water is to be eftimated by 
the weight of a pillar of Water ^ whofe Bafis is equal to the lower 
Orifice of the Pipe (which we fuppofe to be parallel to the Hori- 
zon)and its height equal to a perpendicu!ar-,reaching thence to the 
top of the Water i though the Pipe be much inclined towards the 
Horizon, or though it be irregularly Hiap'd, and much broader in 
fome parts, than the faid Orifice. 
7, That a Bodyjimmerfed in a Fkiid/uflrains a Lateral preffore 
from the Fluid , and that increafed, as the depth of the iirimerfed 
Body, beneath the Surface of the Fluid, inct eafech, 
8-: That Water may be made as well to deprefs a Body lighter 
than it felf, as to buoy it up. 
9. That, whatever is faid of Pofitive Levity, a parcel of Oyl * 
lighter than Water, naay be kept in Water without afcending in if. 
10. That the caufe of the Afcenfion of Water in SyphonSoand 
of its flowing through them ^ may be explicated without having a 
recourfe to Nature's abhorrency of a Vacuum, 
1 1. That a Solid Body,as ponderous as any yet known^lhougb 
near the Top of the water it will fink by its own weight > yet if it 
be placed at a greater depth , than that of twenty times its own 
thicknefsiit will not fink,if its defccnt be not affifted by the weight 
of the incumbent Water. 
Thele are the ParadGxer, evinced by our Authour with much 
evidence and exaitnefs 5 and very likely to invite Ingenious men ^ 
£0 cultivate and to make further difquifitiooj in fo excellent a part 
of Philofophy 2 as are the /^j/^ro/?(^^/V(^i 5 an Artdeferving great 
Ehgiums^ not only, upon the account of its Theorems and Problems, 
which are moft of them pure and handfoEieprodudicnvof Rea- 
fouj very delightful and divers of them furprifing , and befides, 
much conducing to the clear explication and tlioiow-anderftand- 
