The scientific world realizes, too, more and more, the power of
character shown by Darwin in all this great career; the faculty of
silence, the reserve of strength seen in keeping his great
thought--his idea of evolution by natural selection--under silent
study and meditation for nearly twenty years, giving no hint of it
to the world at large, but working in every field to secure proofs
or disproofs, and accumulating masses of precious material for the
solution of the questions involved.
To one man only did he reveal his thought--to Dr. Joseph Hooker, to
whom in 1844, under the seal of secrecy, he gave a summary of his
conclusions. Not until fourteen years later occurred the event
which showed him that the fulness of time had come--the letter from
Alfred Russel Wallace, to whom, in brilliant researches during the
decade from 1848 to 1858, in Brazil and in the Malay Archipelago,
the same truth of evolution by natural selection had been revealed.
Among the proofs that scientific study does no injury to the more
delicate shades of sentiment is the well-known story of this letter.
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