According to Cook and Wedderburn (XXI.305), the Supplementary Cabinet was 'a cabinet which Ruskin placed in the School but did not fill'; the examples which they listed were placed there shortly before their catalogue was published in 1906.
Presumably presented by John Ruskin to the Ruskin Drawing School (University of Oxford); first recorded in the Ruskin Drawing School in 1878; transferred from the Ruskin Drawing School to the Ashmolean Museum c.1949
Taylor, Gerald, ‘John Ruskin: A Catalogue of Drawings by John Ruskin in the Ashmolean Museum, Oxford’, 7 fascicles, 1998, Oxford, Ashmolean Museum, no. 053
Ruskin, John, ‘Rudimentary Series 1878’, 1878, Oxford, Oxford University Archives, cat. Rudimentary no. 116
Ruskin, John, ‘The Ruskin Art Collection at Oxford: Catalogues, Notes and Instructions’, Edward T. Cook and Alexander Wedderburn, eds, The Works of John Ruskin: Library Edition, 39 (London: George Allen, 1903-1912), 21, cat. Supplementary no. 171
I give place next to another of the drawings executed for Modern Painters because the method of execution used in it, pencil washed with neutral tint, will enable the student often to obtain memoranda of chiaroscuro for which pencil alone would be too weak, and sepia too coarse. The drawing also represents, better than the engraving, the general effect of Turner’s Sunset seen from Goldau, so frequently alluded to in my lectureswritings .