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. Darwin believes we cannot "put any limit to the possible and even probable migration of plants". Wants good book on plant morphology.
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