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Chiefly letters from Haldane to Beatrice Bateson re his request for mermission to use Bateson's slide collection for teaching purposes. There is one draft of a reply by Beatrice and a related letter to her from 'NB'.

Hagedoorn's letters to Bateson, 1910-1913, discuss variation in some animals and plants, including dogs, rats and taraxacum. There are accompanying illustrations on three small pieces of card relating to variation in dog colours. Included also is a copy of a letter from J.B.S. Haldane to Sir Kenneth Mather, nd.

Darlingon's correspondence with J.B.S. Haldane, R.C. Punnett and L. Hogben chiefly re a paper or papers by J.W.H. Harrison on induced melanism in lepidoptera. Darlington's letters are manuscript drafts, for one of which (to Punnett) there is a typescript copy. The letters to Darlington are from Haldane (one) and Punnett (three).

4pp manuscript notes; 7pp manuscript draft titled 'Mathematical theory of chromosome rings' and typescript revised version; 12pp manuscript notes on 'Root cuttings'.

Haldane's notes were found clipped to the draft pages by Darlington.