Volume 4 in Monographs in Virology, edited by A. Robert Neurath and Benjamin A. Rubin, Wyeth Laboratories, Inc., Department of Research and Development, Philadelphia. 87 pages, illustrated. S. Karger AG, Medical and Scientific Publishers, Arnold-Böcklin-Strasse 25, CH-4000 Basel 11, Switzerland. Sfr. 27. U.S. $6.50. DM. 27. £2.85