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[ r 69 I pours) spina the ides of the mountains, being there flopped in its courfe, it mull neccliarily ahead and pafs over their tops. This air, therefore, will bc confiderably cooled in its progrefs up the ides and over the tops of the mountains, and confequently

mull let go a great part of thc watery vapours it contains ; which will be precipitated in dew and moiflure upon the furlace of the mountain, where it will foak into the earthy parts, or 'pinnate itfelf into the chinks and crevices of the rocks, where being

coll.:fled, it will afterwards break out in fprings and fountains, and become the fource of rivers, which are known always to take their rife in mountainous

and, on this account, we might have finall fprings and riven near mountains, although there were neither clouds nor rain. But the moiflute, which the air slimily depot-nes on the mouncountries ,

tains, mull be confiderably increafed by the clouds, which are driven againft them, and accumulated by the winds, for their particles being then prelled together will run into fmall drops of rain. Belida, it is well known, that mountains do gather and retain

the clouds ahout them by their attradive force, in timifequence of which we often fee fome cicuds continue at reft on the mountains, whillt the others arc

carried on gently by the wind ; hence it is, that countries, in the neighbourhood of high mountains, are the molt fuloied to frequent rains. Thus I have thewn bow the aftent of aqueous vapours, and their constant circulation, by precipitating again in modlure, or drops of rain, will arife from the diliblving power of the air, influenced by thc niciffisude of heat and cold, rarefaaion and conlenfation. For we Vol.. IN. find, Z

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