List of Participants 



CONTENTS 



Preface. 



vu 



SESSION I 



LEUKAEMOGENESIS : QUANTITATIVE ASPECTS AND 



CO-FACTORS 



Chairman: E. E. Pochin 



Introduction by R. H. Mole 3 



Effects of Low X-Ray Doses (0-1-1 r) on Haematopoiesis Shown by 



Cytological and Haematological Study and ^^Fe Incorporation — 



A Four Months' Survey. By H. ]\Iaisin 17 



Leukaemogenic Effect of Whole-body ^^CO-y-Irradiation Compared 



with ^H-Thymidine and ^H-Cytidine: Preliminary Report on the 



Development of Thymic Lymphomas in C57BL/6J Mice. By H. 



Cottier, E. P. Cronkite, E. A. Tonna, and N. 0. Nielsen 27 



The Effect of Single and Fractionated Doses of Irradiation on the 



Haematopoietic Systems of C57BL Mice. By P. C. Roller and 



Valerie Wallis 35 



New Evidence on the Mechanism of Radiation Leukaemogenesis. By 



I. Berenblum and N. Trainin 41 



A Comparative Study of the Late Effects of Certain Radiomimetic 



Drugs and X-Rays. By L. Nemeth 57 



Serial Transplantation of Haematopoietic Tissue in Irradiated Hosts. 



By P. C. Roller and S. M. A. Doak 59 



SESSION II 



LEURAEMOGENESIS : ROLE OF VIRUSES AND 

 CYTOLOGICAL ASPECTS 



Chairman: H. Curtis 



Introduction by Arthur C. Upton 67 



Chromosomes in Murine Pre-Leukaemia. By P. L. T. Ilbery, P. A. 



Moore, S. M. Winn, and C. E. Ford 83 



IX 



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