According to Cook and Wedderburn (XXI.291 n. 5), the drawing was removed from the Teaching Collection by Ruskin. It has not been traced, and is represented here by the photogravure reproduction by Allen & Co. included in the Library Edition.
Presumably presented by John Ruskin to the Ruskin Drawing School (University of Oxford)
Taylor, Gerald, ‘John Ruskin: A Catalogue of Drawings by John Ruskin in the Ashmolean Museum, Oxford’, 7 fascicles, 1998, Oxford, Ashmolean Museum, no. 357
Ruskin, John, ‘Rudimentary Series 1878’, 1878, Oxford, Oxford University Archives, cat. Rudimentary no. 283
Ruskin, John, ‘The Works of John Ruskin’, Edward T. Cook and Alexander Wedderburn, eds, The Works of John Ruskin: Library Edition, 39 (London: George Allen, 1903-1912), vol. XXI, pl. LXVI, f.p. 292
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