[Sidenote: There may be Cones and Piramides of any Matter, which
demitted with the Point downwards do float atop.]
_It is manifest, also, that one may make Cones and Piramids of any
Matter whatsoever, more grave than the water, which being put
into the water, with the Apix or Point downwards, rest without
Submersion._
Because if we reassume what hath been above demonstrated, of Prisms
and Cylinders, and that on Bases equall to those of the said
Cylinders, we make Cones of the same Matter, and three times as high
as the Cylinders, they shall rest afloat, for that in Mass and Gravity
they shall be equall to those Cylinders, and by having their Bases
equall to those of the Cylinders, they shall leave equall Masses of
Air included within the Ramparts. This, which for Example sake hath
been demonstrated, in Prisms, Cylinders, Cones and Piramids, might be
proved in all other Solid Figures, but it would require a whole Volume
(such is the multitude and variety of their Symptoms and Accidents) to
comprehend the particuler demonstration of them all, and of their
severall Segments: but I will to avoid prolixity in the present
Discourse, content my self, that by what I have declared every one of
ordinary Capacity may comprehend, that there is not any Matter so
grave, no not Gold it self, of which one may not form all sorts of
Figures, which by vertue of the superiour Air adherent to them, and
not by the Waters Resistance of Penetration, do remain afloat, so that
they sink not. Nay, farther, I will shew, for removing that Error,
that,