DISCUSSION 



the link would be irretrievably broken ; but if the salt bond is merely dissociated it 

 can be remade and in the case of newly synthesized twin chromatids it could be 

 remade in more than one way. This gives a possible explanation of chromosome 

 breaks and rearrangements. 



REFERENCES 



^ Lea, D. E. Actions of Radiations on Living Cells. London, Cambridge University Press 

 1946. 



2 Gray, L. H. Brit. J. Radiol. 1947, Suppl. 1 7. 



3 Spiers, F. W. Discussiotu of the Faraday Society, 1952, 12 13. 



* OsTERGREN, G. and VVakonig, G. Proc. 9th Int. Cong. Genetics, Bellagio, 1953. Botaniska 

 Notiser, 1954. 



281 



