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OF MOTION.
I ask whether the true motion of the clouds can be known by the
motion of their shadows; and in like manner of the motion of the
sun.
9
99.
To know better the direction of the winds. [Footnote: In connection
with this text I may here mention a hygrometer, drawn and probably
invented by Leonardo. A facsimile of this is given in Vol. I, p. 297
with the note: 'Modi di pesare l'arie eddi sapere quando s'a
arrompere il tepo' (Mode of weighing the air and of knowing when
the weather will change); by the sponge "Spugnea" is written.]
The globe an organism.
1
000.
Nothing originates in a spot where there is no sentient, vegetable
and rational life; feathers grow upon birds and are changed every
year; hairs grow upon animals and are changed every year, excepting
some parts, like the hairs of the beard in lions, cats and their
like. The grass grows in the fields, and the leaves on the trees,
and every year they are, in great part, renewed. So that we might
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