Quotation from: The Notebooks of Leonardo Da Vinci

Written by: Leonardo da Vinci


Under ground, and under the foundations of buildings, timbers are
found of wrought beams and already black. Such were found in my time
in those diggings at Castel Fiorentino. And these had been in that
deep place before the sand carried by the Arno into the sea, then
covering the plain, had heen raised to such a height; and before the
plains of Casentino had been so much lowered, by the earth being
constantly carried down from them.

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