Page:Huygens-Celestial-Worlds-Discovered.pdf/33

Rh aur’d in but one Comet, what it was that is the Caue of that trange Appearance, hould we not make that a Standard to judge of all others by? ’Tis therefore an Argument of no small Weight that is fetch’d from on their Relation and Likenes; and to reaon from what we ee and are ure of, to what we cannot, is no fale Logick. This mut be our Method in this Treatie, wherein from the Nature and Circumtances of that Planet which we ee before our Eyes, we may gues at thoe that are farther ditant from us.

And, Firt, ’tis more than probable that the Bodies of the Planets are olid like that of our Earth, and that they don’t want what we call Gravity, that Virtue, which like a Loadtone attracts whatoever is near the Body to its Center. And that they have uch a Quality, their very Figure is a Proof; for their Roundnes proceeds only from an equal preure of all their Parts tending to the ame Center. Nay more, we are o skilful now-a-days, as to be able to tell how much