Darwin-Hooker Letters : Letter from C. R. Darwin to J. D. Hooker 4 May [1865]
Darwin, Charles Robert
Darwin-Hooker Letters
<p style='text-align: justify;'>On FitzRoy’s life and character.</p><p style='text-align: justify;'>Carl von Siebold’s cases of males and females of gall insects [<i>True parthenogenesis in moths and bees</i> (1857)]. Each sex produced on different plants.</p><p style='text-align: justify;'>Haeckel’s astonishing case of propagation in a Medusa.</p>