Now from the foregoing Theory is it not probable to suppose, that a _Torrent of Air rushed_ continually down from the etherial Regions, not only to supply the Fire of the Crater; but also the Vacuity caused by the perpetual Elevation of Vapours and heated Air from below: the Torrent likewise _depressing_ into the Track with itself, the Volumes of Smoke which were seen to roll directly down the Sides of the Mountain: that this descending Torrent of Air, in its Progress, dispelled the Clouds forming round the Sides of the Mountain, by the Ascent of warm Vapours condensing, as they rose, on their Approach to the cold Mountain: the Smoke shooting _horizontally_, from that Height _only_, at which an _horizontal Current of Air_ began to take Place? For it can hardly be imagined that the Air at the Top of Etna, found to be “_electrical_,” and which must have been replete with a Mixture of Floguiston, inflammable Air, Gasses, and other aërial Fluids highly rarefied, heated, +dry+, (and consequently lighter,) _at the Instant_ of rising out of the glowing Cauldron, became so condensed as to fall like Water, without partaking of the Motion of a _violent_ Wind, supposed to blow in an horizontal Direction. 267. Glas, in his Account of Teneriffe,[77] reports, that the Clouds are generally half as high as the Peak, above the Sea,[78] i.e. according to him, near the Height of a Mile and Half: “_below_ which Clouds, the _North Easterly Winds_ +generally+ prevail: and, at the same Time, _above them_, we find a _fresh Westerly_ +Gale+: which I believe to be the Case _in every Part of the World when the_ +trade wind+ blows.” In Page 253, he says, that in ascending above the Level of the Clouds, he found the Air sharp, cold and piercing: and the Wind blew strong from South West, and West South West: so that the Wind blew towards the Mountain from three different Points at least, viz. the Trade Wind, from North East below the Clouds; just above them, from South West: and still higher, a fresh Gale, from West. “The Air on the Top of the Pike was thin, cold, piercing; and of a dry parching Nature, like the South Easterly Winds which I have felt in the great Desert of Africa, or the Levanters in the Mediterranean: or even not unlike those dry easterly Winds which are frequent in the Northern Parts of Europe, in clear Weather, in the Months of March or April,” Page 257. This dry Wind answers to the Eknèfiai (before mentioned) i.e. _Wind descending_ +from the clouds+. Glas further observes (Page 250) that the Clouds, in fine Weather, descend gradually towards Evening, and rest on the Woods till Morning: when they re-ascend, and remain suspended above them, till the succeeding Evening.