See letter from Emile Alglave, 13 January 1877 and n. 2. Alglave evidently sent CD a copy of Delboeuf 1877, but it is missing from the Darwin Pamphlet Collection–CUL. CD did make a note of it, however, in his list of abstracts of quarto pamphlets (DAR 75: 99). CD evidently drafted this letter for his son Francis Darwin to write.