CONTENTS 



Cytological Observations on Bad. coli, Proteus vulgaris and Various 

 Aerobic Spore-Forming Bacteria with Special Reference to the Nuclear 

 Structures, by C. F. Robinow 17 2 



Studies on the Chemical Nature of the Substance Inducing Transforma- 

 tion of Pneumococcal Types, by Oswald T. Avery, Colin M. 

 MacLeod, and Maclyn McCarty 187 



Induced Lysogenicity and Mutation of Bacteriophage within Lysogenic 



Bacteria, by F. M. Burnet and Dora Lush 210 



Mutations of Bacterial Viruses Affecting Their Host Range, 



by S. E. Luria 222 



Genetic Recombination between Host-Range and Plaque-Type Mutants 

 of Bacteriophage in Single Bacterial Cells, by A. D. Hershey and 

 Raquel Rotman 238 



Genetic Recombinations Leading to Production of Active Bacteriophage 

 from Ultraviolet Inactivated Bacteriophage Particles, by S. E. Luria 



AND R. DULBECCO 266 



Bibliography 299 



