the lower Orifice of the Pipe
(which we suppose to be parallel to the Horizon) 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 shap'd, and
much broader in some parts, than the said Orifice.

7. That a Body, immersed in a Fluid, sustains a Lateral pressure from the
Fluid; and that increased, as the depth of the immersed Body, beneath the
Surface of the Fluid, increaseth.

8. That Water may be made as well to depress a Body lighter than it self,
as to buoy it up.

9. That, whatever is said of Positive Levity, a parcel of Oyl lighter than
Water, may be kept in Water without ascending in it.

10. That the cause of the Ascension of Water in Syphons, and of its flowing
through them, may be explicated without having a recourse to Nature's
abhorrency of a _Vacuum_.

11. That a Solid Body, as ponderous as any yet known, though near the Top
of the water it will sink by its own weight; yet if it be placed at a
greater depth, than that of twenty times its own thickness; it will not
sink, if its descent be not assisted by the weight of the incumbent Water.

These are the _Paradoxes_, evinced by our Authour with much evidence and
exactness, and very likely to invite Ingenious men to cultivate and to make
further disquisitions in so excellent a part of Philosophy, as are the
_Hydrostaticks_; and Art deserving great _Elogiums_, not only, upon the
account of the _Theorems_ and _Problems_, which are most of them pure and
handsome productions of Reason, very delightful and divers of them
surprising, and besides, much conducing to the clear explication and {176}
thorow-understanding of many both familiar and abstruse _Phaenomena_ of
Nature; but also, upon the score of its _Practical_ use, since the
Propositions, it teaches, may be of great importance to Navigation, and to
those that inquire into the Magnitudes and Gravities of Bodies, as also to
them, that deal in Salt-works: Besides, that the _Hydrostaticks_ may be
made divers waies serviceable to _Chymists_, as the Author intimates, and
intends to make manifest, upon several occasions, in his yet unpublisht
part of the _Usefulness of Natural and Experimental Philosophy_.

These Propositions are shut up by two important _Appendixes_, whereof the
_one_ contains an Answer to seven Objections by a late learned Writer, to
evince, that the upper parts of water press not up