And these being the only Observations, I have yet met with, wherein _Baroscopes_, at some _Distance of Place_, and _Difference of Height_, have been compar'd (though I cannot now send you the Reflexions, I have else where made upon them;) as the opportunity I had to make them my self, rendred them not unpleasant to me, so perhaps the Novelty will keep them from being unwelcome to you. And I confess, I have had some flying suspicions, that the odd _Phaenomena_ of the _Baroscope_, which have hitherto more pos'd, than instructed us, may in time, if a {184} 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. [Sidenote: * _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._] 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. * 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 be 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 usual, 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. [Sidenote: * _See Number 9. _Phil. Transact._ p. 157. 5. 8 & 9. where the Word, _Generally_, signifies no more, than _for the most part_._]