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ARW's admiration of Darwin's Origin of species; birds and mammals better indicators of zoological geography than insects; exchange of specimens with Bates; plans to return to England in about 18 months; imminent voyage to Timor.
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Has received letters of January and March on his return last month. Thanks for papers but has not received the list of longicorns of Australia. "The quantity of obscure species in my collections are beginning to frighten me." Has just packed over 13,000 specimens, but they are particularly poor in longicorns and Coleoptera generally. The geographical distribution of insects in the archipelago is far less strongly marked than that of birds and mammals, may be imputed to the greater liability of insects to accidental dispersion etc.
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Darwin references a "capital" letter he has received from ARW following ARW's reading of On the Origin of Species.