[54] Nam fit, ut interdum tanquam demissâ Columnâ In Mare de Cœlo descendat.—Lucr. L. 6. V. 425. _Una_ Eurus Notusque ruunt, creberque Procellis Africus. Also Omnia Ventorum _concurrere_ Prælia vidi. +Virgil.+ [55] Franklin’s Account of Whirlwinds and Waterspouts, in his Miscellaneous Tracts. Lowthorp’s Abridgement of Phil. Trans. Vol. 2. Page 103. Varenius Geogr. Gen. C. 21, Pag. 265. A clear Account of the Effects of a +depression+ is to be met with in “the History of Jamaica, in 3 vols. vol. 3. Page 800, on _Trade and Land Winds_.” [56] Mons. Maupertius has found, that the extreme Cold at Tornea, in the northern Regions beyond the Artic Circle, came directly from _above_: see “La Figure de la Terre,” Page 59. Il semble que le vent souffle—de tous Côtés à la Fois; et il lance la _Neige_ avec une telle Impetuosité, qu’en un Moment tous les Chemins font perdus. “It seems that the Wind blows from all Points of the Compass at once,” &c. [57] The Doctrine of smokey Chimnies distinctly treated of under the Article +smoke+, in the Encyclopædia Britannica, may receive some Improvement, from Circumstances which ascertain the sudden Descent, Elevation, and quick Depression of _Columns_ or rather _Torrents_ of Air, viz. by widening the Tubes, and covering their Tops. [58] It is thought more _candid_, and will to _many_ be more _satisfactory_; to make occasional References to different Authors who have treated distinctly on a Subject, and leave the Reader to draw his own Conclusions by applying to their _express_ Words;—than, either to insert abundant Quotations; or _weave_ their Thoughts into the _Texture_ of the Work: which must encrease its Bulk, without producing any Thing either new or instructive. [59] Once, particularly, in the Month of January, at Lausanne: Farenheit’s Thermometer at 7 only: the Country covered with Snow; and a North Wind beating +violently+ on the Lake, which continued liquid without Ice: owing, perhaps, in _Part_, to subterranean Heat, and Exhalations. [60] The Depression and Reverberation of the Wind near Rivers, and its Descent from Mountains, _a Point to be discussed_, may furnish a Hint and Reason, why Rain falls more in one Place, than in another not far distant: and why in the same Place it falls in different Quantities, at different Heights, irregularly. [61] Cavallo’s Treatise on Air, Page 446.—— [62] 442.—— [63] 441.—— [64] 442. [65] It is _light_ in Consequence of its _Warmth_, when compared with the _cooler condensed Air_ above it.