SESSION V 



Chairman: w. l, russell 

 MECHANISMS OF LIFE-SPAN SHORTENING 



By H. J. MULLER 



Detection of Segmentary Heterochromia in Foetuses Irradiated 



in utero 



By J. LEJEUNE AND M.-O. RETHORE 



Chromosome Aberrations in Liver Cells in Relation to Ageing 



By H. J. CURTIS AND CATHRYN CROWLEY 



The Failure of the Potent Mutagenic Chemical, Ethyl Methane Sulphonase, 



to Shorten the Life-span of Mice 



By PETER ALEXANDER AND MISS D. I. CONNELL 



Life-span Shortening from Various Tissue Insults 



By H. J. CURTIS AND CATHRYN CROWLEY 



Does Radiation Age or Produce Non-specific Life-shortening? 



By R. H. MOLE 



Differences between Radiation-induced Life-span Shortening in Mice and 

 Normal Ageing as Revealed by Serial Kilhng 



By PETER ALEXANDER AND MISS D. I. CONNELL 



Age-Specific Death Rates of Mice Exposed to Ionizing Radiation and 



Radiomimetic Agents 



By A. C. UPTON, M. A. KASTENBAUM, AND J. W. CONKLIN 



8* 



