[1] Forman appears to have also owned the 1831 study/sketch(?) of this painting, now in the Hospitalfield House collection, Abroath, Scotland; see ArtUK https://artuk.org/discover/artworks/the-italian-family-ferry-on-the-river-ninfa-128739/search/actor:williams-penry-17981885/page/1/view_as/grid. The posthumous Catalogue of the collection formed by the Late W.H. Forman…removed in 1892 to Callaly Castle, Northumberland by Major A. H. Browne, by William Chaffers (printed for private circulation 1892), contains a listing for this on p. 205, no. 1 The Italian Ferry. No dimensions are given. See https://archive.org/stream/catalogueofworks00chaf#page/204/mode/2up
[2] Charles Eastlake letter to Redmond Barry, 1 August 1864. One of the initial eleven paintings selected,and purchased by Sir Charles Eastlake as the founding collection of the NGV.
Royal Academy, London, 1835, no. 226; British Institution, London, 1839, no. 284; Fine Arts Gallery, International Exhibition, London, 1862, British Division, no. 498, as Ferry on the River Ninfa, Pontine Marshes, lent by W. H. Forman; First Exhibition of Pictures, north wing of Public Library, Melbourne, opened 24 December 1864; Fine Arts Gallery (Compartment 10), Intercolonial Exhibition, Melbourne, 1866, no. 315; First Loan Exhibition of Works of Art, National Gallery of Victoria, Melbourne, 1869, no. 491B.