Darwin-Hooker Letters : Letter from C. R. Darwin to J. D. Hooker [18 September 1845]
Darwin, Charles Robert
Darwin-Hooker Letters
<p style='text-align: justify;'><i>Kosmos</i> [by Alexander von Humboldt] has arrived safely.</p><p style='text-align: justify;'>CD acknowledges his presumption in speculating on variation without having worked out his due share of species, but "for nine years it has been anyhow the greatest amusement to me".</p>