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the representations be on the wall.
[
Footnote: 70. 15--23. This section has already been published in the
Saggio delle Opere di Leonardo da Vinci" Milan 1872, pp. 13, 14.
"
G. Govi observes upon it, that Leonardo is not to be regarded as the
inventor of the Camera obscura, but that he was the first to explain
by it the structure of the eye. An account of the Camera obscura
first occurs in CESARE CESARINI's Italian version of Vitruvius, pub.
1
523, four years after Leonardo's death. Cesarini expressly names
Benedettino Don Papnutio as the inventor of the Camera obscura. In
his explanation of the function of the eye by a comparison with the
Camera obscura Leonardo was the precursor of G. CARDANO, Professor
of Medicine at Bologna (died 1576) and it appears highly probable
that this is, in fact, the very discovery which Leonardo ascribes to
himself in section 21 without giving any further details.]
7
1.
HOW THE IMAGES OF OBJECTS RECEIVED BY THE EYE INTERSECT WITHIN
THE
CRYSTALLINE HUMOUR OF THE EYE.
An experiment, showing how objects transmit their images or
pictures, intersecting within the eye in the crystalline humour, is
seen when by some small round hole penetrate the images of
illuminated objects into a very dark chamber. Then, receive these
7
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