18 JULY 1981, Page 17

Fourth dimension

Sir: For some years I have been working on the history of the fourth dimension, with particular reference to Edwin Abbott Abbott (1838-1926), author of Flatland and 40 other books, and Howard Candler, his lifelong friend. I would be extremely grateful to any reader who can help me to find information or papers of relevance. Professor Thomas Banchoff

Institut des Hautes Etudes Scientifiques, 35 Route de Chartres, Bures-sur-Yvette, France