the Stones manifestly to move to and fro in the Parlour, to the great amazement and fright of all the Family. The Hill, whereon this _Brill_ stands, I have observ'd to be very well stor'd with Mineral substances of several kinds; and from thence I have been inform'd by others, that this Earth-quake reach'd a good many miles; but I have neither leasure, nor inclination to entertain you with uncertain reports of the Extent and other Circumstances, especially since a little further time an inquiry may enable me to give you a better warranted account. * * * * * _Some Observations and Directions about the _Barometer_, communicated by the same Hand, to the _Author_ of this _Tract_._ These shall be set down, as they came to hand in another Letter; _videl._ [Sidenote: * _See _Num. 9_. of the _Phil. Transact_. p. 159 the last _paragraph_._] As to the _Barometrical_ Observations (as for brevities sake I use to call them) though you * guessed aright, that, when I saw those of the Learned and Inquisitive Dr. _Beale_, I had not Mine by me, (for I left them, some years since, in the hands of a _Virtuoso_, nor have I now the leasure to look after those Papers;) yet since by the Communication, you have made publick, 'tis probable, that divers Ingenious men will be invited to attempt the like Observations, I shall (notwithstanding my present haste) mention to you some particulars, which perhaps will not appear unseasonable, that came into my mind upon the reading of what you have presented the Curious. [Sidenote: * _Some whereof have been since invited by the _Publisher_, to give their concurrence herein_.] When I did, as you may remember, some years agoe, publickly express and desire that some Inquisitive men would {182} make _Baroscopical_ Observations in several parts of _England_ (if not in forrain Countries * also;) and to assist them, to do so, presented some of my Friends with the necessary Instruments: The declared reason of my desiring this Correspondence was (among other things) that by comparing Notes, _the Extent of the Atmospherical Changes, in point of Weight, might be the better estimated_. But not having hitherto received some account, that I hoped for, I shall now, without staying for them, intimate thus much to you: That it will be very convenient, that the Observers take notice not only of the _day_, but as near as they can, of the _Houre_ wherein the height of the _Mercurial Cylinder_ is observ'd: For I have often found, that within less than the compass of one day, or perhaps half a day, the Altitude of it has so considerably vary'd, as to make it in many cases difficult, to conclude any thing certainly from Observations, that agree but in the day.