Inflamed: Thus the great Aristotle, and some late Astrenomers, as Re∣giomontanus, a groat Promoter of all Mathematical and Astronomical Studies▪ and that learned French∣man Piso, and others, hold that Comets are set on fire by the rays of the Sun. Whereas others, as Heraclides Ponticus of old, and some of late will have them to be subtile and Diaphanous matter ex∣haled from the Earth into the Air, and there, by reason of the Sun∣beams which they receive into them, Enlightened and made bright, but not Enflamed. But that Comets are of Earthly Original, though it was credited of old, and by a few of the Moderns, yet it will hardly gain belief at this time of Day. It is now generally asserted, that most of them are above the Moon (of which you shall hear more anon:) and if their Seat be so high, it will be difficult to persuade men that they were exhaled from the Earth. 0