the Planetary Worlds.
19
Book I.
aſſur’d in but one Comet, what it was that is the Cauſe of that ſtrange Appearance, ſhould we not make that a Standard to judge of all others by? ’Tis therefore an Argument of noArguments from their Similitude, of no ſmall weight. small Weight that is fetch’d from on their Relation and Likeneſs; and to reaſon from what we ſee and are ſure of, to what we cannot, is no falſe Logick. This muſt be our Method in this Treatiſe, wherein from the Nature and Circumſtances of that Planet
which we ſee before our Eyes, we may gueſs at thoſe that are farther diſtant from us.
much