The Bloomsbury Series in Clinical Science is growing and changing. Its Editorial Board and contributors were all originally selected from, or had links with, the University College and Middlesex School of Medicine. Now, as the Series develops, board members and con­ tributors alike identify with the wider reaches of Bloomsbury and Islington. The aims of the Series remain, however, to highlight, to review and to record significant areas of research and development in the field of clinical science. All contributors are experts in their particular field and monographs may be the work of a single author or several, guided by individual editors. Diseases in the Homosexual Male is the third monograph in the Series. Edited by Michael Adler, Professor of Genito-Urinary Medicine at the University College and Middlesex School of Medicine, it presents contributions from a number of distinguished workers with special expertise. AIDS has perhaps highlighted the problem but this monograph illustrates the wider profile and gives wit­ ness to the multidisciplinary nature of clinical science.