III
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The falsity of this view may be inferred merely from the fact that wind by no means invariably accompanies a cloud-laden atmosphere, and yet more particles have gathered at that than at any other time in a narrow space, where they produce condensation and heaviness in the clouds. Besides, in the neighbourhood of rivers and lakes cloud is frequent from the confinement and accumulation of particles, and yet there is no attendant wind. Indeed, sometimes such a darkness over-spreads the place that the view of objects in the immediate vicinity is cut off; which would never happen unless numerous particles were massed in a small space. Yet no period is more free from wind than a period of cloud. Add now a consideration of an opposite character: When the sun rarefies at his rising the thick dank morning air, then a breeze springs up; the particles have got more room now, and the thickly packed crowd of them is broken up.