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Darwin-Hooker Letters : Letter from C. R. Darwin to J. D. Hooker   11 [December 1854]

Darwin, Charles Robert

Darwin-Hooker Letters

<p style='text-align: justify;'>Debates aberrant species, e.g., <i>Ornithorhynchus</i> and <i>Echidna</i>, with JDH. CD argues they are result of extinction having removed intermediate links to allied forms.</p><p style='text-align: justify;'>Studying effects of disuse in wings of tame and wild ducks.</p><p style='text-align: justify;'>Tabulations showing that number of species in a genus is not correlated with number of genera in an order.</p>

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