The correspondent is conjectured to be Jones on the basis of his visit to CD in London on 23 April 1866 (see letter to H. B. Jones, [23 April 1866?]). The date of 13 April is given in the sale catalogue. The year is established by the dates of CD’s visit to London in 1866 (see n. 2, below). No records have been found of an April visit to London that was delayed in any other year.