Context:

Referenced when comparing Darwin and Fitzroy's relationship to that of Aubrey and Maturin, noting Darwin's role as a gentleman companion similar to Dr. Maturin in the naval novels

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Referenced when describing the hideous iguanas on the Galapagos Islands, comparing the scene to Conan Doyle's adventure novel

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Referenced when discussing Fitzroy's description of the Galapagos as 'pandemonium,' noting this word comes from Milton's epic poem describing hell

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Darwin's published journal from his voyage, first published in 1839 as 'Journal Remarks' and reissued as 'Voyage of the Beagle,' discussed in context of his observations about finch beaks

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Referenced as Darwin's major work where the Galapagos finches feature as evidence for his theory of evolution by natural selection