[Sidenote: All Figures of all Matters, float by hep of the
Rampart replenished with Air, and some but only touch the water.]
_All sorts of Figures of whatsoever Matter, albeit more grave than
the Water, do by Benefit of the said Rampart, not only float, but
some Figures, though of the gravest Matter, do stay wholly above
Water, wetting only the inferiour Surface that toucheth the
Water._
And these shall be all Figures, which from the inferiour Base upwards,
grow lesser and lesser; the which we shall exemplifie for this time in
Piramides or Cones, of which Figures the passions are common. We will
demonstrate therefore, that,
_It is possible to form a Piramide, of any whatsoever Matter
preposed, which being put with its Base upon the Water, rests not
only without submerging, but without wetting it more then its
Base._
For the explication of which it is requisite, that we first
demonstrate the subsequent Lemma, namely, that,