A drawing of a classical sacrifice in a similar medium is in the Biblioteca Nacional, Madrid, O. Delgado, Paret Y Alcazar, Madrid, 1957, no. 49, fig. 29. The Madrid drawing is described as having been mounted on a sheet of heavy paper by the artist so that he could hang it in his studio, O. Delgado, op. cit., no. 49. The thick mount of the present drawing may suggest a similar function