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* direct »Letter 745 — Hooker, J. D. to Darwin, C. R., 5 Apr 1844
Answer to CD's query on genera and species ranges.Comments on typical forms.Preparing first part of Galapagos plants for printing.
* direct »Letter 1743 — Watson, H. C. to Darwin, C. R., 17 Aug 1855
Sends a catalogue of plants [missing] with the close species marked.
* direct »Letter 1758 — Watson, H. C. to Darwin, C. R., 2 Oct 1855
Expresses his general opinion on the relative closeness of species in large and small genera. Warns that the size of a genus is dependent upon the locality and extent of the flora studied, that definitions of close species are not consistent, and that peculiarities of botanical classification will influence any attempt to assess the comparative closeness of species in different genera.
* direct »Letter 1911 — Hooker, J. D. to Darwin, C. R., [26 June or 3 July 1856]
Can no longer make out story of NW. American plants; consulting Asa Gray. Questionable validity of seed-salting experiments. Aristolochia and Viscum seem to shed pollen before flower opens. Ray Society should only do translations. Thomas Thomson in India has rediscovered Aldrovanda, a rare relative of Drosera.
* direct »Letter 2880 — Darwin, C. R. to Hooker, J. D., 29 July [1860]
Casual observations on Drosera. Wants to know author of good review of Origin in London Review [& Wkly J. Polit. 1 (1860): 11–12, 32–3, 58–9]. Athenæum will reprint Gray's discussion.
* direct »Letter 2892 — Darwin, C. R. to Hooker, J. D., 7 Aug [1860]
Owen wants to be civil, and sneer behind CD's back. Those, like Rudolph Wagner, who want to go halfway on theory, are "booked to go further". Anatomy of orchids. Huxley says K. E. von Baer goes "a great way with me".
* direct »Letter 2886 — Darwin, C. R. to Hooker, J. D., 31 [Aug 1860]
Observations on Drosera: plants can distinguish minute quantities of nitrogenous substances.
* direct »Letter 2905 — Darwin, C. R. to Hooker, J. D., 2 Sept [1860]
CD has a low opinion of British entomologists. Lyell's ingenious difficulties with natural selection show he is in earnest. Asks JDH to observe beetles and variation of stripes in mules on his Syrian tour.
* direct »Letter 2908 — Darwin, C. R. to Hooker, J. D., 6 Sept [1860]
Thanks JDH for agreeing to observe coats of asses and mules in Middle East. Asks for observations on vigour of plants as JDH ascends mountains. Ad hominem article in Athenæum [review of John Tyndall, Glaciers of the Alps, 1 Sept 1860, pp. 280–2]. Reports extensive experiments on Drosera.Observations on orchid anatomy.
* direct »Letter 2913 — Darwin, C. R. to Oliver, Daniel, 11 Sept [1860]
Requests observations on Drosera and Dionaea, and asks DO to look up Buchanan and Wight on insectivorous plants ["Conspectus of Indian Utricularia", Hooker's J. Bot. 1 (1849): 372–4].