CONTENTS XI 



The Cholesterol Concentration in Adrenal Glands of Hypophysecto- 

 mized-grafted Rats (with and without Destroyed Median Emin- 

 ence) after Whole-body Exposure to a Lethal Dose of X-Rays. 

 By P. N. Martinovitch, D. Pavi6, D. Sladic-Simic, and N, 

 Z1VKOV16 221 



The Cellular Basis and Aetiology of the Late Effects of Irradiation on 



Fertility in Female Mice, By W. L. Russell and E. F. Oakberg 229 



SESSION V 



MECHANISMS OF LIFE-SPAN SHORTENING 



Chairman: W. L. Russell 



Introduction by H. J. Muller 235 



Detection of Segmentary Heterochromia in Foetuses Irradiated in 



utero. By J. Lejeune and M.-O. Rethore 247 



Chromosome Aberrations in Liver Cells in Relation to Ageing. By 



H. J. Curtis, and Cathryn Crowley 251 



The Failure of the Potent Mutagenic Chemical, Ethyl Methane Sul- 



phonate, to Shorten the Life-span of Mice. By Peter Alexander 



and Miss D. I. Connell 259 



Life-span Shortening from Various Tissue Insults. By H. J. Curtis 



AND Cathryn Crowley 267 



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



R. H. Mole 273 



Differences between Radiation-induced Life-span Shortening in Mice 



and Normal Ageing as Revealed by Serial Killing. By Peter 



Alexander and Miss D. I. Connell 277 



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



Radiomimetic Agents. By A. C. Upton, M. A. Kastenbaum, and 



J. W. CONKLIN 285 



session VI 



THE MODIFICATION OF THE LATE EFFECTS OF 

 IONIZING RADIATION 



Chairman: C. H. Gray 



Introduction by 0. C. A. Scott 301 



Apparent Radiation Protection Against Local Ageing Effects in the 



Skin of Mice. By Herman B. Chase 309 



