“I shall draw… a figure (which all these matters are made clear as far as possible on a surface, but the full demonstration would require a body like the eye… The eye of a cow, pig, and other animals can be used for illustration, if anyone wishes to experiment.”

— Roger Bacon , book Opus Majus

v. i. iii. 3, ed. Bridges as quoted in A.C. Crombie, Robert Grossetest and the Origins of Experimental Science 1100-1700 (1953)
Opus Majus, c. 1267

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Roger Bacon 21

medieval philosopher and theologian 1220–1292

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