Labels:text | screenshot | font OCR: "12 cases. . . . These are cases that have to be placed at the beginning." A Leonardo presents an argument about the circulation of water through the earth similar to the one on 21v, where the emphasis is on the movement of water. The cases listed on 25r begin with discussions on the interaction of air and water and introduce the subsequent development of his theories. Leonardo returns to the problem at the heart of his exploration of the body of the earth,
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