This book is a result of a Workshop held at the Institute of Virology of the Univer- sity of Wurzburg, Germany in March of 1975. The Workshop was organized to bring together investigators of slow virus infections and other scientists, who have not engaged in such research, but who were Ieaders in the field of biologic investi- gations. The conveners hoped that these latter would be more objective critics, who would express their views freely and who would offer recommendations for new directions and new approaches to the investigations of slow virus infections. These expectations were...