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Darwin had cataloged and described all of the species collected on his Beagle trip except one

Darwin had cataloged and described all of the species collected on his Beagle trip except one

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Darwin had cataloged and described all of the species collected on his  Beagle  trip  except one: a barnacle. Darwin felt that he should establish himself as an expert on one  species before daring to make generalizations about all of them. His growing friendship  with Joseph Hooker reinforced this feeling. Hooker was a botanical expert who, in one of  his letters to Darwin, included a comment which Darwin took to mean that those who  speculated about species and evolution– including himself–should be more careful. And  Darwin himself remained anxious about the consequences of his theory of evolution by  natural selection. Even though he had great confidence in it, he worried for his  reputation and for the survival of his theory if he published it without being able to  support it with irrefutable evidence. Finally, it turned out that barnacles, far from being 
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