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<p>Mostly correspondence concerning data on the frequency of colour blindness in populations. Includes correspondence between Professor Hans Kalmus and Sir Cyril Lodowic Burt, Sir Bryan Harold Cabot Matthews, Dr W Jaeger (written in German), Professor Tage Kemp, Professor A Franceschetti, Prof J ten Doesschate, Professor C Kosswig, Dr D J Nolte, Dr Philip V Tobias, Professor Helgi Tomasson, Dr Jan A Book, Professor F Clarke Fraser, Professor Kunizo Hukuda, Dr L D Sanghvi, Professor Manfred Richter, Leiutenant Commander J C van Epen, Dr J Zwarteveen, Dr Carl-Erik Groth, Dr Agnes Crawford, Professor Hans J Gloor, and Dr M A Bouman. Also includes miscellaneous manuscript and typescript notes.</p>

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