Book reviews receptor multiplicity proposed.Perhaps the most novel and most interesting of the chapters contained in this volume are the small mainly philosophical works included throughout the volume which deal with future approaches and strategies to research in the central nervous system.Although short, the views expressed by Costa, Carlsson, Bunney and Bloom give con- siderable insight into the direction that research might take and the problems it will face in future.In conclusion, a patchy book not dealing with any subject in particular, but which will no doubt find its place on many library shelves.