The Description of a New World, Called the Blazing-World

This Relation confirmed partly the observation of the Bird-men concerning the cause of Snow; but since they had made mention that that same extract, which by its commixture with Water made Snow, proceeded from the Element of Fire, that is under the Moon: The Emperess asked them, of what nature that Elementary Fire was; whether it was like ordinary Fire here upon Earth, or such a Fire as is within the bowels of the Earth, and as the famous Mountains Vesuvius and Ætna do burn withal; or whether it was such a sort of fire, as is found in flints, &c. They answered, That the Elementary Fire, which is underneath the Sun, was not so solid as any of those mentioned fires; because it had no solid fuel to feed on; but yet it was much like the flame of ordinary fire, onely somewhat more thin and fluid; for Flame, said they, is nothing else but the airy part of a fired Body. Lastly, the Empress asked the Bird-men of the nature of Thunder and Lightning? and whether it was not caused by roves of Ice falling upon each other?