1 The Langham Hotel, in Portland Place, was built in 1864,

Although greatly damaged in the Second World War, the building still stands, housing offices and studios of the British Broadcasting Corporation (Weinreb and Hibbert, 446).

2 This letter was written after Clemens’s Brighton excursion, and presumably in time to reach Osgood in London before his departure on 19 September (Weber, 130).

3 The photograph does not survive, but was almost certainly the “London picture” taken by Charles Watkins (5 Oct 72 to Fitzgibbon), the only known print of which was inscribed to “Mr. Sandifer.” (A “Jabez Sandifer,” otherwise unidentified, is listed in the 1873 London Directory {2147}.) It is reproduced in Photographs and Manuscript Facsimiles.

4 While in Brighton on 12 September Clemens had several photographs taken at the studio of W. and A. H. Fry, “Art Photographers and Miniature Painters”: four poses are known to be extant. Clemens, Lee, and Routledge also sat for a group photograph, and on one of the surviving copies, each man signed his name under his picture. All of the surviving Brighton poses are reproduced in Photographs and Manuscript Facsimiles.