REFERENCES 75 



9. DEMEREC, M. Behavior of two mutable genes of Delphin- 

 ium ajacis. Jour. Genetics 24, 179-93 (1931). 



10. DOBZHANSKY, T. Genetics and the Origin of Species 

 (New York: Columbia University Press, 1941), p. 37. 



11. EPHRATI-ELIZUR, E., P. R. SRINIVASAN and S. 

 ZAMENHOF. Genetic analysis, by means of transforma- 

 tion, of histidine linkage groups in Bacillus subtilis. Proc. 

 Nat. Acad. Sci. 47, 56-63 (1961). 



12. GLANVILLE, E. V., and M. DEMEREC. Threonine, 

 isoleucine, and isoleucine-valine mutants of Salmonella 

 typhimurium. Genetics 45, 1359-74 (1960). 



13. GASS, E. A., and A. NOVICK. Induction of mutation in 

 chloramphenicol-inhibited bacteria. Jour. Bacterial. 77, 

 10-16 (1959). 



14. GOLD, E. R., G. H. TOVEY, W. E. BENNEY, and 

 F. J. LEWIS. Changes in the group A antigen in a case of 

 leukemia. Nature 183, 892-93 (1959). 



15. GOWANS, C. S. Some genetic investigations on Chlamy- 

 domonas eugametos. Z. indukt. Abstamm. Vererb. Lehre 91, 

 63-73 (1960). 



16. HALDANE, J. B. S. The mutation rate of the gene for 

 hemophilia and its segregation ratio in males and females. 

 Ann. Bug., Lond. 13, 262-71 (1947). 



17. HALDANE, J. B. S. Mutation in the sex-linked type of 

 muscular dystrophy. A possible sex difference. Ann. Human 

 Genet. 20, 344-47 (1956). 



18. HESLOT, H. Schizosaccharomyces pombe ; un nouvel organ- 

 isme pour I'etude de la mutagenese chimique. Abh. 

 Deutsche Akad. Wiss. Berlin, Kla.sse Medizin, Jahrgang, 

 1960:98. 



19. KODANI, M. Personal communication. 



20. LIEB, M. Forward and reverse mutation in a histidine- 

 requiring strain of Escherichia coli. Genetics 36, 460-77 

 (1951). 



21. MCFALL, E., A. B. PARDEE and G. S. STENT. Effects af 

 radiophosphorus decay on some synthetic capacities of bac- 

 teria. Biochim. et Biophys. Acta 27, 282-97 (1958). 



22. MIYAKE, T. Mutator factor in Salmonella typhimurium. 

 Genetics 45, 11-14 (1960). 



23. MULLER, H. J. The nature of the genetic effects produced 

 by radiation. In Radiation Biology, ed. by A. Hollaender 

 (New York: McGraw-Hill, 1954), 1, 351-473. 



24. NEEL, J. V. Phenotypic variability in mutant characters of 

 Drosophila junebris. J. Exp. Zool. 75, 131-42 (1937). 



25. NEEL, J. v., W. J. SCHULL and K. TAKESHIMA. A 

 note on achondrophasia in Japan. Jap. Jour. Human Genet. 

 4, 165-72 (1959). 



26. OAKBERG, E. F. A description of spermiogenesis in the 

 mouse and its use in analysis of the cycle of the seminifer- 



