The reprinted papers are numbered from i to 20; citations to the literature 

 at large are numbered from 21 to 142, alphabetized by authors' names. Choice 

 of citations has been dictated by the same general considerations as were applied 

 to the reprints, and many interesting examples of specific mutant types have 

 necessarily been omitted. Many reviews are available which provide more 

 detailed and balanced accounts of specific subjects; these are listed with 

 an asterisk (*). 



1. Luria, S. E., and Delbruck, M. ( 1943 



Mutations of bacteria from virus 

 sensitivity to virus resistance. Gene- 

 tics 28:491-511. 



2. Lea, D. E., and Coulson, C. A., 1949 



The distribution of the numbers 

 of mutants in bacterial populations. 

 J. Genet. 49 : 264-285. 



3. Newcombe, Howard B., 1949 Origin 



of bacterial variants. Nature 164 : 

 150. 



4. Newcomlx;, Howard B., 1948 De- 



layed phenotypic expression of 

 spontaneous mutations in Escheri- 

 chia coli. Genetics 33 : 447-476. 



5. Demerec, M., 1948 Origin of bac- 



terial resistance to antibiotics. J. 

 Bact. 56 : 63-74. 



6. Cavalli, L. L., and Maccacaro, G. A., 



1950 Chloromycetin resistance in 

 E. coli, a case of quantitative in- 

 heritance in bacteria. Nature 166 : 

 991-992. 



7. Davis, Bernard D., 1950 Studies on 



nutritionally deficient bacterial mu- 

 tants isolated by means of penicil- 

 lin. Experientia 6 : 41-50. 



8. Bruner, D. W., and Edward, P. R., 



1941 The demonstration of non- 

 specific components in Salmonella 

 paratyphi A by induced variation. 

 J. Bact. 42 : 467-478. 



9. Edwards, P. R., Barnes, L. A., and 



Babcock, Mary C., 1950 The nat- 

 ural occurrence of phase 2 of 

 Salmonella paratyphi A. J. Bact. 

 59: 135-136. 



10. Bruner, D. W., and Edwards, P. R., 



1948 Changes induced in the O 

 antigens of Salmonella. J. Bact. 55 : 

 449. 



11. Witkin, Evelyn M., 1947 Mutations 



in Escherichia coli induced by 

 chemical agents. Cold Spring Har- 

 bor Svmposia on Quantitative Bio- 

 logy 12 : 256-269. 



12. Goodlow, Robert J., Mika, Leonard 



A., and Braun, Werner, 1950 The 



effect of metabolites upon growth 

 and variation of Brucella abortus. J. 

 Bact. 60:291-300. 



13. I^ederberg, Joshua, 1947 Gene re- 



combination and linked segrega- 

 tions in Escherichia coli. Genetics 

 32 : 505-525. 



14. Lederberg, Joshua, 1949 Aberrant 



heterozygotes in Escherichia coli. 

 Proc. nat. Acad. Sci. U.S. 35 : 178- 

 184. 



15. Robinow, C. F., 1944 Cytological ob- 



servations on Bact. coli, Proteus vul- 

 garis and various aerobic spore- 

 forming bacteria with special refer- 

 ence to the nuclear structures. J. 

 Hyg. 43:413-423. 



16. Avery, Oswald T., MacLeod, Colin 



M., and McCarty, Maclyn, 1944 

 Studies on the chemical nature of 

 the substance inducing transforma- 

 tion of pneumococcal types. J. Exp. 

 Med. 79: 137-158. 



17. Burnet, F. M., and Lush, Dora, 1936 



Induced lysogenicity and mutation 

 of bacteriophage within lysogenic 

 bacteria. Austr. J. Exp. Biol. Med. 

 Sci. 14:27-38. 



18. Luria, S. E., 1945 Mutations of bac- 



terial viruses affecting their host 

 range. Genetics 30 : 84-99. 



19. Hershey, A. D., and Rotman, Raquel, 



1949 Genetic recombination be- 

 tween host-range and plaque-type 

 mutants of bacteriophage in single 

 bacterial cells. Genetics 34 : 44-71. 



20. Luria, S. E., and Dulbecco, R., 1949 



Genetic recombinations leading to 

 production of active bacteriophage 

 from ultraviolet inactivated bacteri- 

 ophage particles. Genetics 34 : 93- 

 122. 



•21. Adams, M. H., 1950 Methods of 

 study of bacterial viruses in "Meth- 

 ods in Medical Research." Vol. II, 

 The Year Book Publishers, Chicago. 



22. Alexander, H. E., and Leidy, G., 1951 

 Determination of inherited traits 



299 



