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6That this is the case, may be proved by observing, that from fountains in covered places, or those which are under ground, no moist vapours rise; whilst in open places exposed to the air, when the rising sun darts his rays upon the earth, he raises the vapours from humid and marshy places, and, gathering them into masses, carries them into the air. If, therefore, in open places, the noxious humours of bodies are carried off by the air, as they are from the earth by means of clouds, there can be no doubt of the necessity of making spacious and pleasant walks open to the air in every city.
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