Labels:text | screenshot | font OCR: beds of their great caverns or lakes, covered and shut within the earth." A The second passage concerns the varying directions of water movement at differing depths. The subject seems, at first reading, unrelated to the discussion on the rest of this and the facing page, but its continuation on 10v clarifies the connection: Leonardo is concerned with the formation of strata which, in part, accounts for the presence of marine fossils on mountaintops. Leonardo was aware, from his reading of Ristoro d'Arezzo and other
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