CD’s observations on preference of Drosera for milk and nitrogenous fluids, and the effect of nitrate of ammonia are interesting. Asks whether CD is satisfied that the effect is not due to density of fluid or to a chemical irritant. His own observations suggest such possibilities.
His results with pure gum on Drosera spathulata entirely support CD’s opinion. Other observations on insectivorous plants.
Extracts from botanical literature dealing with Dionaea, intercrossing, and sensitivity. [Bot. Ztg. (1833): 96; Thomas Nuttall, Genera of N. American plants (1818)].
Quotes note by Julius Milde on Drosera rotundifolia from Botanische Zeitung (1852): 540.
Dr Hooker has given him CD’s memorandum on the fly-catcher.
Copies out extract from Curtis’ Botanical Magazine [On Apocynum androsæmifolium, 8 (1794): tab.]: 280 and gives a further reference in Erasmus Darwin’s The loves of plants [1789]. Suggests that they look at Apocynum.
Finds no trace of nectar in Stanhopea saccata.
List of references on orchid structure and fertilisation.
Refers CD to a paper which he ought to know: Ch. Fermond, "Faits pour servir à l’histoire générale de la fécondation chez les végétaux", Recueil des travaux de la Société d’émulation pour les sciences pharmaceutiques 3 (1859).
Cites descriptions of melastomads in C. V. Naudin, Annales des Sciences Naturelles 3d ser., vols. 12–18.
Now believes flowers of Fumariaceae must be self-fertilised.
Planning a piece on dimorphism in the Natural History Review ["On the two forms, or dimorphic condition, in the species of Primula … by Charles Darwin", n.s. 2 (1862): 235–43].
Observations on Campanula dimorphism.
Discusses primrose ovules,
Atlantis paper [Nat. Hist. Rev. (1862): 149–70],
plant migrations;
Corydalis.
Distinguishes two kinds of floral dimorphism: that affecting sexual organs and that affecting outer envelopes.
Thanks for Orchids.
Sends orchids from W. H. Gower.
Sends flowers with anthers of two colours.
Has given directions to save seeds of Lythrum hyssopifolium.
CD’s diagram of Lythrum salicaria is very remarkable. [See Collected papers 2: 107.]
Informs CD of possible dimorphism of Epilobium angustifolium.
The number of "aquatic" flowers is reduced if one considers only those that expand under water.
Lecturing at Norwich.
DO thinks an essay [Alexander Braun’s "Rejuvenescence", Ray Society (1853)] is not worth reading with respect to some difficulty concerning phyllotaxy.
Answers CD’s query on Primula longiflora and P. scotica.
Would like abstract of CD’s paper ["Two forms of Linum", Collected papers 2: 93–105] for Natural History Review.
