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Portrait of the English physician, biologist and engineer Erasmus Darwin (1731-1802). He studied at Cambridge and obtained his medical degree at Edinburgh in 1754. Erasmus Darwin, grandfather of Charles Darwin, was an early theorist on evolution suggesting in his book Zoonomia (1796) that evolutionary changes are induced by the influence of the environment where an organism lives. He was also an able engineer devising improved carriages, windmills and oil lamps.
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