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Heston, W. E. (1949) Induction of pulmonary tumors in strain A mice with methyl- 

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(1950) Carcinogenic action of the mustards. Cancer Research, 10: 224. 



Hinton, T., P. T. Ives, and A. T. Evans (1952) Changing the gene order and number 



in natural populations. Evolution, 6: 19-28. 

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for the production of mutations with improved fermentation. Ann. Missouri 



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of ultraviolet-induced mutations in Aspergillus terreus. I. Production of the 



mutations. Am. J. Botany, 32: 160-165. 

 Ives, P. T., and M. B. Andrews (1946) Analysis of the sex-linked mutation rate in 



'the Florida "high " stock. Genetics, 31 : 220. 

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limbata by means of ultraviolet radiation. Anat. Record, 34: 108-109. 

 Kaplan, W. D. (1948) Formaldehyde as a mutagen in Drosophila. Science, 108: 43. 

 Kaufmann, B. P. (1939) Distribution of induced breaks along the X-chromosome of 



Drosophila melanogasier . Proc. Natl. Acad. Sci. U.S., 25: 571-577. 

 Kerkis, J. J. (1935) The preponderance of "physiological mutations." Summ. 



Commun XV intern, physiol. Congr. (Leningrad-Moscow), pp. 198-200. 



(1938) The frequency of mutations affecting viability. Izvest. Akad. Nauk 



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(1939) Effect of temperature below 0° upon the process of mutation and 



some consideration of the causes of spontaneous mutation. Compt. rend. acad. 

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Koller, P. C. (1949) The behaviour of the tumor cell under the influence of irradi- 

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, M. Y. Ansari, and J. M. Robson (1943) The action of mustard gas on the 



pollen grain nucleus of Tradescantia. Report to the Ministry of Supply (Gr. 

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Kossikov, K. V. (1936) The influence of the age and sex of the germ cells on the fre- 

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mutation in Drosophila simulans and Drosophila melanogaster. Genetics, 22: 

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Lamy, R., and H. J. Muller (1939) Evidence of the non-genetic nature of the lethal 

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