In this volume I have attempted to cover the more important aspects of immunosuppressive therapy. In doing this, I have been very fortunate in securing the help of the distinguished authors who have contributed the chapters that follow and I am grateful to them for providing such thorough and up-to-date accounts of their subjects. Immunosuppression can be mediated by many hundreds of agents and it has been difficult to strike a balance between the 'small print' of drug action in animals and the useful- ness or otherwise of drugs and other agents for inducing immunosuppression in patients. The...