The date range is established by the address. CD visited his brother, Erasmus Alvey Darwin, at 57 Queen Anne Street, London, from 1852, when Erasmus moved there (see Correspondence vol. 5, letter to W. D. Fox, 24 [October 1852]). In spring 1860 the house number was changed to ‘6’ (see Post Office London directory 1861 and Correspondence vol. 8, letter to a Bookseller, 13 [May 1860]).