VI TABLE OF CONTENTS 



1931 • Harriet S. Creighton and Barbara McClintock 



A Correlation of Cytological and Genetical Crossing- 

 over in Zea mays 155 



1933 • T. S. Painter 



A New Method for the Study of Chromosome Re- 

 arrangements and Plotting of Chromosome Maps 161 



1936 • Calvin B. Bridges 



The Bar "Gene" a Duplication 163 



1941 • G. W. Beadle and E. L. Tatum 



Genetic Control of Biochemical Reactions in Neuro- 

 spora 166 



1944 • O. T. Avery, C. M. A/IacLeod, and Maclyn McCarty 

 Studies on the Chemical Nature of the Substance 

 Inducing Transformation of Pneumococcal Types 173 



1946 • J. Lederberg and E. L. Tatum 



Gene Recombination in Escherichia coli 192 



1947 • Genetics Conference, Committee on Atomic 



Casualties, National Research Council 



Genetic Effects of the Atomic Bombs in Hiroshima 



and Nagasaki 194 



1950 • Barbara A4cClintock 



The Origin and Behavior of Mutable Loci in Maize 199 



1951 • N. H. Horowitz and Urs Leupold 



Some Recent Studies Bearing on the One Gene-One 

 Enzyme Hypothesis 209 



1952 • N. D. Zinder and J. Lederberg 



Genetic Exchange in Salmonella 221 



1953 • J. D. Watson and F. H. C. Crick 



Molecular Structure of Nucleic Acids 241 



1954 • L. J. Stadler 



The Gene 244 



1954 • A. H. Sturtevant 



Social Implications of the Genetics of Man 259 



1955 • H. Fraenkel-Conrat and R. C Williams 



Reconstitution of Active Tobacco Mosaic Virus from 



its Inactive Protein and Nucleic Acid Components 264 



1955 • Seymour Benzer 



Fine Structure of a Genetic Region in Bacteriophage 271 



