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persuaded of the merits of this somewhat abused diagnostic technique. That the authors have been able to accomplish this mammoth task including a useful bibliography inside 300 pages is a remarkable compliment to their selective judgement as well as to the admirable brevity and readability of their literary style. This further edition of an authoritative, compact and readable book will prove even more successful than its predecessors and well merits its obligatory place in every general medical as well as neurological and psychiatric library. G. STERN University College Hospital, London WC1