Sent by Alfred Russel Wallace, Ternate Island, Moluccas, [Indonesia] to Henry Walter Bates [none given] on 24 December 1860.
Re. Alfred Russel Wallace'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.
Marchant, James. (1916). I. Early letters (1854-62). 45-88. In: Marchant, James. Alfred Russel Wallace Letters and Reminiscences, Vol. 1. Cassell and Company, Ltd, London, New York, Toronto and Melbourne. i-xi, 1-320. [p. 72-73]