Although this volume, which is the report of a recent symposium held in London under the auspices of the CIBA Foundation, would be of greatest interest to laboratory workers in virology, it should also be available for reference reading to anyone concerned with problems of infectious disease. The participants at this symposium were principally from England but there were also a scattering of others from the United States, Germany, Russia, France, and Czechoslovakia. The book contains thirteen individual chapters which are actually the formal papers read by the authors, and following each manuscript is added the recorded discussion of fellow participants.