This note was sold as part of a collection of items from CD to Williams & Norgate; CD regularly purchased books from the firm. The date is established by the relationship between this letter and the letter to F. M. Balfour, 4 September 1880.
The first volume of Balfour 1880–1 was published between 1 and 14 June 1880 (Publishers’ Circular (1880): 453). Bastian 1880, by Henry Charlton Bastian, was published between 16 and 31 May 1880 (ibid., p. 415). CD’s copies of both works are in the Darwin Library–Down.
Semper 1881, by Carl Gottfried Semper, was published by C. Kegan Paul & Co. as volume 31 of the International Scientific Series; CD’s copy is the Darwin Library–CUL. CD had read proof-sheets of the German edition (Semper 1880; see Correspondence vol. 27, letter to C. G. Semper, 2 October 1879).
Manuscript Alterations and Comments
1.1 (Comparative … Balfour)] square brackets in ms
2.1 (The … Co))] after del ‘Bastian’; square brackets in ms