Page:Philosophical Transactions - Volume 001.djvu/190

 as of the Changes of the Air, that accompanied it. To inform you of which, I must relate to you, that riding one Evening somewhat what late betwixt Oxford & a Lodging, I have at a place, 4. miles distant from it, the weather having been for a pretty while Frosty, I found the Wind so very cold, that it reduced me to put on some defensives against it, which I never since, nor, if I forget not, all the foregoing part of the Winter was obliged to make use off. My unwillingness to stay long in so troublesome a Cold, which continued very piercing, till I had got half way home-ward, did put me upon galloping at no very lasy rate; and yet, before I could get to my Lodgings, I found the Wind turned, and felt the Rain falling; which, considering the shortness of the time, and that this Accident was preceded by a setled Frost, was surprising to me, and induced me to mention it at my return, I, as one of the greatest and suddainest Alterations of Air, I had ever observ'd: And what changes I found, have been taken notice of in the Gravity of the Atmosphere at the same time by that Accurate Observer *Dr. Wallis, who then suspected nothing of what follow'd; as I suppose, he has ere this told you himself. Soon after, by my guess about an hour, there was a manifest Trembling in the House where I was (which stands high in comparison of Oxford.} But it was not there so great, but that I, who chanced to have my thoughts busied enough on other matters, than the weather, should not have taken notice of it as an Earth-quake, but have imputed it to some other cause, if one, that you know, whose hand is employed in this Paper, and begins to be a diligent observer of Natural things, had not advertis'd me of it; as being taken notice of by him and the rest of the people of the House. And soon after there hapned a brisk Storm; whereupon I sent to make inquiry at a place call'd Brill, which standing upon a much higher ground, I supposed might be more obnoxious to the effects of the Earth-quake (of which, had I had any suspicion of it, my having formerly been in one neer the Lacus Lemanus, would have made me the more observant:) But the person I sent to, being Rh