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competent number of Correspondents do diligently prosecute the Inquiries (especially with Baroscopes, accommodated with Mr. Hooks ingenious additions) make men some Luciferous discoveries, that possibly we do not yet dream off.
I know not, whether it will be worth while to add, that since I was oblig'd to leave London, I have been put upon so many lesser removes, that I have not been able to make Baroscopical Observations with such a constancy, as I have wished, but, as far as I remember, the Quick-silver has been for the most part, so high, as to invite me to take notice of it; and to desire you to do me the favour to inquire among your correspondents whether they have observ'd the same thing. * This hath been inquired into, and is found, that several Accurate and Curious persons (as the Most Noble President of the Royal Society, the lord Viscount Brounker, Doctor Beale, Mr. Hook &c.) have observed the same. * For, if they have, this lasting (though not uninterrupted) Altitude of the Quick-silver, happening, when the Seasons of the year have been extraordinary dry (so much as to become a grievance, and to dry up, as one of the late Gazettes informs us, some springs near Waymouth, that used to run constantly) it may be worth inquiry, whether these obstinate Droughts, may not by cleaving of the ground too deep, and making it also in some places more porous and as it were, spungy, give a more copious Vent, than is ufual, to subterraneal steams, which adscending into the Air, increase the gravity of it. The inducements I have to propose this inquiry, I must not now stay to mention. But perhaps, if the Observation holds, it may prove not useless in reference to some Diseases.
Perhaps it will be needless to put you in mind of directing those Virtuosi, that may desire your Instructions about Baroscopes, to set down in their Diarys not only the day of the month, and the hour of the day, when the Mercuries height is taken, but (in a distinct Columne) the weather, especially the Winds, both as to the Quarters, whence they blow (though that be not always so easy nor necessary,) and as to the Violence or Remisness, wherewith they blow. For, though it be more difficult,
