Labels:text | screenshot | font OCR: made; Leonardo disagrees. He studies in detail how the churning of the Deluge waters would have affected the deposit of shells and considers a variety of conditions that make water powerful. He determines to write his own book (or what would be to us a chapter) on the subject of places occupied by fresh water. This discussion concerns the problem, frequently encountered in the codex, of accounting for the presence of shells on mountaintops. Leonardo the hydraulic engineer draws from his own experience: "A great quantity of shells may be
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