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Charles Darwin, busy in the preparation of his great work on the origin of species, celebrates his fiftieth birthday

Charles Darwin, photograph
A sickly Charles Darwin celebrated his fiftieth birthday by taking the waters at Moor Park in England as he prepared his great manuscript on the origin of the species.  The work, rushed after twenty years of reflection because competitors were about to put forward their own theories, was published on November 22, 1859.  It sold out the same day.  (By John Osborne)
Source Citation: 
Adrian Desmond, James Richard Moore, Darwin: The Life of a Tormented Evolutionist (New York: W. W. Norton & Company, 1994), 476.