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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).

Files split into individuals and corporate bodies, each ordered alphabetically by correspondent

Correspondence between Dodds and other scientists, embassies and other contacts, preparing for, during and after expedition to research and collect cultivated diploid potato samples from South America, traveling to Columbia, Bolivia and Peru, including visits to Venezuela, Ecuador, Argentina, Brazil and Chile, 24 November 1959 - 5 April 1960.

Arranged alphabetically by surname or name of organisation. Letters that are signed with initials only (the writer being unidentifiable) have been placed at the end of the sequence for the relevant letter of the alphabet, i.e. a letter signed 'A.T.' would be found at the end of 'T'.

Copy of a letter from Darlington to Allen & Unwin Ltd (publishers), with lists of classification categories, 1953; copies of three letters by Darlington to various scientists requesting permission to reproduce figures, 1953.