4 June 2008
OPTICS. Manuscript on paper, 'Come nell occhio nostro se fa la visione', [17th Century], in an informal 17th-century hand, possibly a draft, with a number of cancellations and emendations, 4 DELICATE DIAGRAMS IN RED CRAYON within the text (one possibly incomplete), in Italian, title page ('Del Occchio' [sic]) and 46 pages, 4to (some browning at lower margins), annotated on title 'Tom. VII. N°. 11.' and 'Humore', vellum boards (split).
The manuscript opens with a series of 18 chapter headings which summarise the work: 'First. That the effect of sight takes place through animal spirits [i spiriti animali] 2. That these spirits are very subtle and that they carry out this operation by the means of the nerves 3. That where the absolute end of the nerve is shall be found the site of the spirit ...', moving on to consider the reception of images on transparent, spherical and illuminated bodies, the effects of light, '10. That all the figure of the thing received within an aperture of the eye is a cone', the workings of this conic projection and why certain objects are seen better than others.
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