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Offprints, including many German authors (in German) 1932-1957. Letter: to Dickinson from Philip H Gregory, Rothamsted Experimental Station, Herts, with attached prints, 22 Jun 1944. Page from Yeoman XXX111 (1926) showing R H Biffen photo with oversized wheat. Booklet: 'Supplication of the Black Aberdeen' by Rudyard Kipling, drawings by G L Stampa (1927).

Research proposals for the National Science Foundation: Memorandum to reviewers, the proposal paper and the review by Roy Markham

Holograph manuscript: 'What is a Gene' by R B S Haldane, 23 pp.

Holograph manuscript: 'A Theory of Structural Changes in Chromosomes', by J B S Haldane, 25pp., includes a rough illustration for 'My Freind Mr Leakey' by J B S Haldane, Cresset Press, London, 1937.

Painting on white card (10.5 x 18 cm) of single red tulip: as in Genus Tulipa (1940), A D Hall, Pl. XXIII: T. Oculus-Solis

Painting on white card (14 x 19 cm): as in Genus Tulipa, A D Hall, Pl. XXVI: T. aleppensis,

Painting on white card of a red tulip labelled 'Tulipa Slapfii'. Single red flower, no leaves. 8.5 x 10.5 cm. Signed 'HCO'. Annotated on reverse "not used in book'.