probata, quæ cœlum pluribus realibus atque imperviis orbibus citra rem replevit. "That this opinion comes neerer to the truth than that common one of Aristotle which hath to no purpose filled the heavens with such reall and impervious Orbes."
2. There is no element of fire, which must be held with this opinion here delivered; for if wee suppose a world in the Moone, then it will follow, that the spheare of fire, either is not there where 'tis usually placed in the concavity of his Orbe, or else that there is no such thing at all, which is most probable, since there are not any such solid Orbs, that by their swift motion might heare and enkindle the adjoyning aire, which is imagined to be the reason of that element. Concerning this see Cardan. Iohannes Pena that learned Frenchman, the noble Tycho, with divers others who have purposely handled this proposition.
