999.
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.
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