Labels:text | screenshot | font OCR: spring the four rivers which flow as many different ways and irrigate all Europe, and there is no other mountain the base of which is at so great an elevation." A In this belief, Leonardo follows Ristoro d'Arezzo's treatise La composizione del mondo (The Composition of the World). In Leonardo's Aristotelian universe, air, the third element, surrounds the watery sphere of the earth not far below the spheres of the sun and the moon. Leonardo's passages on atmosphere suggest
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