What caused Darwin to rush into publication,On the Origin of Species in 1859?

Name: What caused Darwin to rush into publication,On the Origin of Species in 1859?
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Darwin received a letter from Alfred Russel Wallace, who had come to similar conclusions about the theory of natural selection, urging him to publish his own work. This prompted Darwin to rush into publishing On the Origin of Species in 1859, rather than risk having his ideas pre-empted by Wallace or someone else.

What Caused Darwin to Rush into Publication,On the Origin of Species