Disorders in cerebral palsied children at Guy's Hospital, and became Reader in Architectural Education at University College London. She then worked with the new clinical course in the Cambridge medical school. Publications include Anatomy of Judgement, Perceptual and Visuo-Motor Disorders in Cerebral Palsy, Aims and Techniques of Group Teaching, and (with P. M. Terry) Talking to Learn. M. L. Johnson died in 1984. Michael Thain was born in Hampstead in 1946 and educated at University College School and Keble College, Oxford, graduating in Zoology and gaining a Diploma in Human Biology. After an. introduction to History and Philosophy of Science at University College London, he graduated in Philosophy from Birkbeck College, London, in 1983, and is currently studying History of Technology at Imperial College, London. In 1969 he joined the staff of Harrow School, where he was Head of Biology for eleven years and is now Head of General Studies and in charge of the school's conservation area. He is collaborating on a- Dictionary of Zoology, also for Penguin, and lives in Harrow with his wife and two children.