Would like to borrow the pamphlet on variation [Frédéric Gérard, "De l’espèce dans les corps organisés" (1844), extract from Dictionnaire universel d’histoire naturelle, ed. C. D. d’Orbigny].

Glad to hear Humboldt’s views on migration. CD believes we cannot "put any limit to the possible and even probable migration of plants".

Wants good book on plant morphology.

Has applied to the Council for the position and Michael Faraday has promised him support. Has also heard of a forthcoming vacancy in the Museum of Economic Geology. Is undecided which to apply for and would welcome JH's views.