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Book 11 of conduits.
Book 12 of canals.
Book 13 of machines turned by water.
Book 14 of raising water.
Book 15 of matters worn away by water.
9
21.
First you shall make a book treating of places occupied by fresh
waters, and the second by salt waters, and the third, how by the
disappearance of these, our parts of the world were made lighter and
in consequence more remote from the centre of the world.
9
22.
First write of all water, in each of its motions; then describe all
its bottoms and their various materials, always referring to the
propositions concerning the said waters; and let the order be good,
for otherwise the work will be confused.
Describe all the forms taken by water from its greatest to its
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