The Ten Books on Architecture, 8.2.2

Vitruvius  translated by Joseph Gwilt

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2The air rushing on, and driving in every direction the vapour before it, creates gales, and blasts, and eddies of wind. Hence the winds, wherever they travel, extract from springs, rivers, marshes, and from the sea, when heated by the sun, condensed vapours, which rise and form clouds. These, borne up by the winds when they come against the sides of mountains, from the shock they sustain, as well as from storms, swell, and, becoming heavy, break and disperse themselves on the earth.

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