0 . . 
6 . If a Body be placed under Water, with its uppermoft Surface 
parallel to the Horizon ; how much Water foever there may be 
©n this or that fide above the Body 5 thediredt prefibre fufteined 
by the Body (for we now confider not the Lateral nor the Recoy* 
lingpreffure,to which the Body may be expofed, if quite environ* 
ed with Water)is no morejthan 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 like wife, 
If the Water 3 that leans upon the Body, be contained in Pipes 
open at both endsjthe preflure of the Water is to be eftimated by 
the weight of a pillar of Water 5 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 perpendicular,reaching thence to the 
top of the Water > though the Pipe be much inclined towards the 
Horizon, or though it be irregularly fhap’d, and much broader in 
fome parts, than the faid Orifice. 
7„ That a Body,immerfed in a Fluid, fuftams a Lateral preffure 
from the Fluid ; and thatincreafed, as the depth of the immerfed 
Body, beneath the Surface of the Fluid, increafeth. 
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, aparcelof Oyl 
lighter than Water, may be kept in Water without afeending in it, 
10. That the caufe of the Afcenfion of Water in Syphons 5 and 
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^though 
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 
thicknefsjit will not fink, if its defeent be not afiifted by the weight 
of the incumbent Water. 
Theie are the Paradoxes , evinced by our Authour with much 
evidence and exadtnefs !,• and very likely to invite Ingenious men 
to cultivate and to make further difquifitions in fo excellent a part 
of Philofophy , as are the Hydroftaticks ; an Art deferving great 
Mediums, not only, upon the account of its Theorems and Problems , 
which are moft of them pure and handfome produ&ions of Rea« 
foil;, very delightful and divers of them furpriling v and beiides, 
much conducing to the dear explication and thorow-underffand- 
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