Darwin-Hooker Letters : Letter from C. R. Darwin to J. D. Hooker 14 [November 1857]
Darwin, Charles Robert
Darwin-Hooker Letters
<p style='text-align: justify;'>Rule that species vary most in larger genera seems universal.</p><p style='text-align: justify;'>Response to <i>Gardeners’ Chronicle</i> note on "Bees and kidney beans" [<i>Collected papers</i> 1: 275–7].</p>