A dissertation upon earthquakes, [electronic resource] : their causes and consequences; Comprehending An Explanation of the Nature and Composition of subterraneous Vapours, their amazing Force, and the Manner in which they operate; the Sentiments, on this Head, of the most learned Philosophers ancient and modern; the different Kinds of Earthquakes, distinguished by their Effects; a cupious Collection of authentick Relations digested under those Titles, the greater Part of which have happened in Great Britain. Together with a distinct account of, and some remarks upon, the shock of an earthquake, felt in the cities of London and Westminster, on Thursday, February 8, 1749-50.