406 BIOLOGICAL EFFECTS OF RADIATION 



association between sensitivity and growth rate undoubtedly exists, both 

 in the development of the organism as a whole and in the development of 

 individual tissues, nevertheless, it appears evident that additional 

 factors also govern sensitivity. A determination of these factors is one 

 of the central problems of radiation. 



REFERENCES' 



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1 Mrs. R. M. Betts of the Biological Library, Princeton University, has aided in 

 the compilation of these references. 



