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| 1 | 306 | 613 | 919 | 1225 |
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1
491.
Hippocrates says that the origin of men's sperm derives from the
brain, and from the lungs and testicles of our parents, where the
final decocture is made, and all the other limbs transmit their
substance to this sperm by means of expiration, because there are no
channels through which they might come to the sperm.
[Footnote: The works of Hippocrates were printed first after
Leonardo's death.]
1
492.
Lucretius in his third [book] 'De Rerum Natura'. The hands, nails
and teeth were (165) the weapons of ancient man.
They also use for a standard a bunch of grass tied to a pole (167).
[
Footnote: Lucretius, de rerum natura libri VI were printed first
about 1473, at Verona in 1486, at Brescia in 1495, at Venice in 1500
and in 1515, and at Florence in 1515. The numbers 165 and 167 noted
by Leonardo at the end of the two passages seem to indicate pages,
but if so, none of the editions just mentioned can here be meant,
nor do these numbers refer to the verses in the poems of Lucretius.]
1
493.
1181
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