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same nature; and as the divisions of the line may bear a certain
proportion to each other, so may the divisions of time.
[Footnote: This passage is repeated word for word on page 190b of
the same manuscript and this is accounted for by the text in Vol. I,
No. 4. Compare also No. 1216.]
9
17.
Describe the nature of Time as distinguished from the Geometrical
definitions.
9
18.
Divide an hour into 3000 parts, and this you can do with a clock by
making the pendulum lighter or heavier.
XVI.
Physical Geography.
Leonardo's researches as to the structure of the earth and sea were
made at a time, when the extended voyages of the Spaniards and
Portuguese had also excited a special interest in geographical
questions in Italy, and particularly in Tuscany. Still, it need
scarcely surprise us to find that in deeper questions, as to the
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