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relation to the Dew, but after finding the Gnats to be multiplied and the little watry Animals to be much lessened in quantity, and finding great numbers of their empty skins floating on the face of his Dew, He thought, he had just reason to perswade himself, the Gnats were by a second Birth produced of those little Animals.

That vapouring away great quantities of his putrefied Dew in Glass Basons, and other Earthen glased Vessels, He did at last obtain, as he remembers, above two pound of Grayish Earth, which when he had washed with more of the same Dew out of all his Basons into one, and vapoured to siccity, lay in leaves one above another, not unlike to some kind of brown Paper, but very friable.

That taking this Earth out, and after he had well ground it on a Marble, and given it a smart Fire, in a coated Retort of Glass, it soon melted and became a Cake in the bottom, when it was cold, and looked as if it had been Salt and Brimstone in a certain proportion melted together; but, as he remembers, was not at all inflammable. This ground again on a Marble, he saith, did turn Spring water of a reddish purple Colour.

That by often calcining and filtring this Earth, He did at last extract about two ounces of a fine small white salt, which, look'd on through a good Microscope, seemed to have Sides and Angles in the same number and figure, as Rochpeeter.

The Motion of the Second Comet predicted by the same Gentleman, who predicted that of the former.

Monsieur Auzout, the same Person, that not long since communicated to the World his Ephemerides touching the course of the former Comet, and recommended several Copies of them to the Royal Society, to compare their Observations with his Account, and thereby, either to verifie his Predictions, or to shew, wherein they differ, hath lately sent another Ephemerides concerning the Motion of the Second Comet, to the same end, that invited him to send the other.

In