21:T4e1,The ageing of many populations in recent years has directed increasing attention to the social, medical and biological problems of senescence. The psychological changes associated with ageing occupy a central position in inquiries in this field. The expectation of mental disorder shows a steep increase with advancing chronological age, and beyond 75 years a large part of this increase is accounted for by disorders associated with degenerative changes in the central nervous system for which we lack remedies at the present time. Larsson et al . (1963) have estimated that the aggregate morbidity risk for these disorders up to the age of 70 is 0·4 per cent., up to age 75, 1·2 per cent. and up to age 80, 5 per cent. For higher ages estimates were probably less reliable, but the calculated risk up to the age of 90 was 5·2 per cent. In a survey of a random sample of elderly people aged 65 and over in the general population, Kay et al . (1964), found a total of 4·2 per cent. of elderly subjects to be suffering from senile dementia, 2·9 per cent. being mild cases. The condition is generally recognized as being a major cause of serious infirmity among the elderly in psychiatric, geriatric, general medical and community practice alike.22:T44e,Diagnostic Criteria From DSM-IV,by the American Psychiatric Association, 358 pp, spiral-bound, $22.50, ISBN 0-89042-064-5, Washington, DC, American Psychiatric Press Inc, 1994. DSM-IV Sourcebook, vol 1, edited by Thomas A. Widiger, Allen J. Frances, Harold Alan Pincus, Michael B. First, Ruth Ross, and Wendy Davis, 768 pp, $112.50, ISBN 0-89042-065-3, Washington, DC, American Psychiatric Association, 1994. DSM-IV: Diagnostic and Statistical Manual of Mental Disorders, fourth edition, was developed with a great deal of input from mental health professionals and professional organizations. In addition, there was a significant collaboration between the American Psychiatric Association (APA) and the World Health Organization, as it developed the tenth revision of theInternational Statistical Classification of Diseases and Related Health Problems (ICD-10). As a result, DSM-IV is a great improvement over the third edition(DSM-III)and the third edition, revised(DSM-III-R). The Task Force onDSM-IVand 13 work groups (each responsible for a section

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