Front Cover; Advances in Virus Research, Volume III; Copyright Paqe; Contributors to Volume III; Contents; Chapter 1. Comparative Biochemistry and Virology; Chapter 2. The Chemotherapy of Viruses; Chapter 3. Tumor Viruses; Chapter 4. Morphology and Development of Insect Viruses; Chapter 5. Multiplication of Plant Viruses in Insect Vectors; Chapter 6. Cross Protection Between Strains of Yellows-type Viruses; Chapter 7. Current Status of Bacterial Transformations; Author Index; Subject Index; Contents of Volumes I-II.