Surtees, A Catalogue
Raisonné, vol. I, no. 527.
Ada Vernon (later Mrs. Hemblen) began sitting for DGR in late 1863, the date of this drawing. DGR gave it to her as a
wedding gift: see DGR's letter to Miss Vernon in
Fredeman, Correspondence, 64. 10
where it is tentatively dated early 1864; but it is possible, indeed likely (given the date on the drawing) that this letter was written in late 1863)