_Martin Folkes_, Esq; LL. D. President of the Royal Society. Since I had the honour to lay before the Society, in the spring, my thoughts upon earthquakes: we have had many further opportunities of reflecting upon that most awful, and hitherto unusual appearance. An earthquake was felt at _Eastwell_ in _Kent_, on _monday march_ 12, and on _sunday, march_ 18, at _Portsmouth_, the _Isle of Wight_, _Southampton_, and along the coast of _Sussex_, the isles of _Guernsey_, _Jersey_. _April_ 2, a smart earthquake at _Manchester_, _Liverpool_, _Taunton_, _Bath_, _Flint_, _Lancaster_, _Wrexham_, reaching 40 miles north and south: 70 miles east and west. Since then at _Rome_, _Naples_, _Leghorn_; in the south of _France_, and at _Pau_ under the _Pyrenean_ mountains: _Oporto_, at _S. Macaire_ in _Guienne_, _Messina_ in _Sicily_, _Munich_ in _Bavaria_, &c. &c. so that the year 1750, may rather be called the year of earthquakes, than of jubilee. For since _February_ last, when they began with us at _London_; as far as I can learn, they have appear'd in many parts of _Europe_, _Asia_, _Africa_, and _America_. And have likewise revisited many counties in our own island, and at length, on the 30th of last _september_ gave much the most extensive shock, we have seen here in our days. It may be well expected, that these frequent visits, in themselves so very extraordinary, to us so rare, and _that_ in one year, should keep up our attention: and as to my own part, induce one to reflect, on what I before offer'd concerning them; and be a sufficient apology for the present paper. We have been acquainted, by those who remember it, that in the earthquake of nov. 1703, which happen'd in _Lincolnshire_, the weather was calm, close, gloomy, warm, and dry; in a degree highly unusual, at that season. And thus it has been with us, all the year. And from the numerous accounts we have receiv'd at the Royal Society, in the beginning, and ending of the year; where any mention is made of the weather; they all agree in the like particular. Which is consentaneous to what I remark'd, as the constant forerunner of earthquakes; and what prepares the earth's surface, for the electrical stroke: which I asserted to be the cause of them.