Darwin-Hooker Letters : Letter from C. R. Darwin to J. D. Hooker 8 April [1857]
Darwin, Charles Robert
Darwin-Hooker Letters
<p style='text-align: justify;'>Independence of variation from climate shown by several plant genera; CD asks for confirmation.</p><p style='text-align: justify;'>Progressing with book [<i>Natural selection</i>].</p>