X CONTENTS 



The Chromosomes in Virus-Induced Murine Leukaemias. By P. C. 



Roller, E. Leuchaes, C. Talukdar, and V. Wallis 93 



Chromosome Abnormalities and the Leukaemic Process. By J. Lejeune 103 



Quantitative Aspects of Experimental Leukaemogenesis by Radiation. 



By R. H. Mole 107 



Effects of Ionizing Radiation on Cellular Components: Electron Micro- 

 scopic Observations. By H. Cottier, B. Roos, and S. Barandum 113 



SESSION III 



CARCINOGENESIS 



Chairman: A. Haddow 



Introduction by A. Glucksmann 121 



The Effect of X-Irradiation Compared to an Apparently Specific Early 



Effect of Skin Carcinogens, By F. Devik 135 



Long-term Consequences of ^''Sr in Rats and the Problem of Carcino- 

 genesis. By K. Sundaram 139 



The Influence of Radiation on the Survival of Mice Injected with 



Ascites Tumour Cells. By V. Drasil 145 



Radiation-induced Bone Tumours — Fractionation Studies. By J. P. M. 



Bensted, N. M. Blackett, V. D. Courtenay, and L. F. 



Lamerton 149 



Carcinogenesis as the Result of Two Independent Rare Events. By R. ^ 



H. Mole 161 



Preliminary Studies on Late Somatic Effects of Radiomimetic Chemicals 



By A. C. Upton, J. W. Conklin, T. P. McDonald, and K. W. 



Christenberry 171 



session IV 



NON-NEOPLASTIC LATE EFFECTS 



Chairman: I. Berenblum 



Introduction by R. Brinkman 179 



Concept and Criteria of Radiologic Ageing. By G. W. Casarett 189 



Initial X-Ray Effects on the Aortic Wall and Their Late Consequences. 



By H. B. Lamberts 207 



The Response of Tissues to Continuous Irradiation. By L. F. Lamerton 213 



