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5The central space between the porticos should be ornamented with verdure, inasmuch as hypæthral walks are very healthy; first, in respect of the eyes, because the air from green plants being light and volatile, insinuates itself into the body when in motion, clears the sight, and, removing the gross humours from the eyes, leaves the vision clear and distinct. Moreover, when the body is heated by the exercise of walking, the air, extracting its humours, diminishes corpulency, dissipating that which is superabundant in the body.
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