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referring to the subject (No. 920). The text given as No. 930
which is also taken from a late note-book of Leonardo's, served as
a basis for the arrangement of the first of the seven books--or
sections--, bearing the title: Of the Nature of Water (Dell'acque
in se).
As I have not made it any part of this undertaking to print the
passages which refer to purely physical principles, it has also been
necessary to exclude those practical researches which, in accordance
with indications given in 920, ought to come in as Books 13, 14
and 15. I can only incidentally mention here that Leonardo--as it
seems to me, especially in his youth--devoted a great deal of
attention to the construction of mills. This is proved by a number
of drawings of very careful and minute execution, which are to be
found in the Codex Atlanticus. Nor was it possible to include his
considerations on the regulation of rivers, the making of canals and
so forth (No. 920, Books 10, 11 and 12); but those passages in
which the structure of a canal is directly connected with notices of
particular places will be found duly inserted under section XVII
(Topographical notes). In Vol. I, No. 5 the text refers to
canal-making in general.
On one point only can the collection of passages included under the
general heading of Physical Geography claim to be complete. When
comparing and sorting the materials for this work I took particular
care not to exclude or omit any text in which a geographical name
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