- British Library, The: BL Add. 46434 ff. 286-288
- Marchant, J. (Ed.). (1916). In: Alfred Russel Wallace; Letters and Reminiscences. Vol. 1. London & New York: Cassell & Co. [p. 304]
Admiration for ARW’s paper, The origin of species and genera, Nineteenth Century (1880). Good use of Allen’s "admirable researches". Disappointment about the Epping Forest appointment. Farrer’s article in Fortnightly Review.