1909
A.J. Finberg, A Complete Inventory of the Drawings of the Turner Bequest, London 1909, vol.I, p.289, CVIII 40a, as ‘“Color is a matterial substance...”’.
1957
Ann [Lapraik] Livermore, ‘J.M.W. Turner’s Unknown Verse-Book’, Connoisseur Yearbook, 1957, p.80.
1966
Jack Lindsay, J.M.W. Turner: His Life and Work: A Critical Biography, London 1966, p.206.
1969
John Gage, Colour in Turner: Poetry and Truth, London 1969, pp.109–10, 249–50 note 179.
1984
Jerrold Ziff, ‘Turner, the Ancients, and the Dignity of the Art’, Turner Studies, vol.3, no.2, Winter 1984, p.49 note 6.
1994
Maurice William Davies, ‘J.M.W. Turner’s Approach to Perspective in his Royal Academy Lectures of 1811’, unpublished Ph.D thesis, Courtauld Institute of Art, London 1994, p.288.