Leonard Nelson

https://friesian.com/nelson.htm

going around among philosophers, some of whom are more honest about it than others. This serves to impeach philosophers in an area that should be of serious interest to them: Curi

Ancient Greece: Optics

https://www.hellenicaworld.com/Greece/Science/en/Optics.html

of colour. Those same philosophers of the Pythagoric school, in assigning the reason of the difference in colours, ascribe it to a mixture of the elements of light ; and divesting
Greece Online Encyclopedia

The Decline of the West| Project Gutenberg

https://www.gutenberg.org/cache/epub/72344/pg72344-images.html

a part of him. What his philosophers occasionally told him on the subject they had heard, not experienced, and what a few brilliant minds in the Asiatic-Greek cities (such as Hipp

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