Darwin-Hooker Letters : Letter from C. R. Darwin to Joseph Dalton Hooker [11 January 1844]
Darwin, Charles Robert
Darwin-Hooker Letters
<p style='text-align: justify;'>Queries on ratios of species to genera on southern islands. CD’s observations on distribution of Galapagos organisms, and on S. American fossils, and facts he has gathered since, lead him to conclusion that species are not immutable; "it is like confessing a murder".</p>