We are very grateful to Nicholas Turner for informing us that in his view, this drawing dates from Guercino's Roman period, 1621-3, rather than the later 1630s, as suggested in the catalogue note. Turner believes that the drawing is a study for The Burial and Assumption of Santa Petronilla, Guercino's altarpiece in the Pinacoteca Capitolina, Rome, of 1623 (see Salerno, I Dipinti del Guercino, Rome 1988, pp. 174-6, no. 92). Furthermore, Turner notes a stylistic comparison between the present sheet and one of the artist's early drawings for the composition in the Royal Library, Windsor Castle, in which the faces of the two mourners are treated in a very similar fashion (see Mahon and Turner, The Drawings of Guercino at Windsor Castle, Cambridge 1989, cat. no. 21).
We are very grateful to Stijn Alsteens for pointing out that this is a view of Montmartre and that a watercolour by Jongkind of the same view is in the Lugt Foundation, Paris. Mr Alsteens also noted that there is a faint impression of the Jongkind studio stamp, lower left (L.1404), with the inscription: Tour
Please note that the attribution to Tissot has been rejected by Krystyna Maty, the expert on the artist. An alternative attribution to Franz Skarbina has been suggested.