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This is the verso of D27849 (Turner Bequest CCLXXXIII 4), and bears watercolour traces offset from D27850 (Turner Bequest CCLXXXIII 5). It is one of a series of eight such offsets in a sequence showing that the nine closely related watercolour studies D27846–D27854 (Turner Bequest CCLXXXIII 1–9) were still bound together at the time of this transference to the adjacent versos in the sequence, though when this was remains a moot point (see the Technical notes in the Introduction to the sketchbook). The effect was not recorded in Finberg’s 1909 Inventory.1
See A.J. Finberg, A Complete Inventory of the Drawings of the Turner Bequest, London 1909, vol.II, p.909.