Part of a Letter from Dr. David Gregory to Dr.Sloane, Dated Oxford, October 12. 1699. Containing His Observations of the Eclipse of the Sun on the 13th of September Last

All Day cloudy and dark, the Gale freshning and veering to East-North-East, the Mercury rising to $29\frac{3}{5}$. 1st. Gray cloudy Weather all Day, with a fresh Gale at North-East; in the Evening some Rain blowing fresh all Night. **January.** 1st. Variable Weather with small Gales at North-East. 2d. Rainy thick Weather all Day and Night with little Wind at North-East. 3d. Continual thick rainy Weather all Day and Night, the Wind at North-East. 4th. Fair Weather somewhat close, and calm all Day and Night. 5th. Close Weather with some Rain and Calm this Forenoon; and in the Afternoon a small Brize at West-North-West. Departed from Emuy. --- V. Part of a Letter from Dr. David Gregory, to Dr. Sloane, dated Oxford, October 12, 1699, containing his observations of the Eclipse of the Sun on the 13th of September last. I send you a Scheme of the Phases of the late Eclipse of the Sun, (see the Table) as I observ'd them. I did not see the beginning of it: But the end happened here, precisely Twenty four Minutes and Nine seconds after Ten a Clock in the Morning, apparent Time, and all the Times marked in the Figure are such: The greatest Observation, which was Ten Digits and a Quarter, was about Seven Minutes after Of the Origin of white Vitriol and the Figure of its Crystals, not yet accounted for, by Dr. Martin Lister, F. R. S. Amongst the Desiderata, relating to Fossil Salts, the Origin that I know of white Vitriol is obscure, and its Crystals undescribed. All I can find of this matter is out of Borrichius de Docimastice metallica, that it is produced from a certain Lead Ore, boiled raw. (Plumbi nigri vena vitriolum album producit, etiam non cremata) none, that I know of, of our English Lead Ores gives us any suspicion of any such Vitriol. It is true, I have by me some Sorts of white Lead Ore Spar-like, plentifully yielding Lead: But I cannot say that either those or any coloured Lead Ores, did give me any reason to suspect, after diverse experiments upon them, that yielded white Vitriol. As to the Crystals of white Vitriol, they are very difficult to describe, and seem to me to be a congeries of infinite small Needles, for which reason it is of a most speedy Operation, and irritates the Stomach suddenly, before they can be well dissolved or broken. I recommend the inquiry of both these particulars concerning white Vitriol, to the Industry and Diligence of the Curious.