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.
Presented by John Ruskin to the Ruskin Drawing School (University of Oxford), 1875; transferred from the Ruskin Drawing School to the Ashmolean Museum, c.1949.
Finberg, Alexander J., The History of Turner's Liber Studiorum: With a New Catalogue Raisonné (London: Ernest Benn, 1924), no. 58.E
Ruskin, John, Instructions in Practice of Elementary Drawing, Arranged with Reference to the First Series of Examples in the Drawings Schools of the University of Oxford (n.p., [1872]), cat. Rudimentary no. 172
Ruskin, John, Instructions in the Preliminary Exercises Arranged for the Lower Drawing-School (London: Smith, Elder, 1872), cat. Rudimentary no. 172
Ruskin, John, Instructions in the Preliminary Exercise Arranged For the Lower Drawing-School (London: Spottiswoode, 1873), cat. Rudimentary no. 172
Ruskin, John, ‘Rudimentary Series 1878’, 1878, Oxford, Oxford University Archives, cat. Rudimentary no. 294
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. 161
For the next stage of completion the etchings of the Liber Studorium show us the preparation which Turner himself made - accurate indication, namely, of every outline, and of the principal shadows, with the pen, before washing with Sepia. The student cannot too often copy the beautiful Etching here given. It affords instances of every kind of touch necessary for the expression of Foliage in Middle Distance, and a beautiful piece of more retiring Forest R. above the stream. The tendency of most, inexperienced, students is always to lose the relations of distance in showers of leafage or gleams of sunshine; but in all great Landscape-work the relative distances of Forest-forms are as determined as, in good architectural work, those of the houses in a street or the pillars of a temple.