CONTENTS 



PAGE 



THE ACTION OF IONIZING RADIATION ON ENZYMES 



AND VIRUSES 70 



Ernest Pollard 



Discussion .......... 74 



LTRRADIATION DES VIRUS 75 



P. Bonet-Maury 



INACTIVATION, PAR LES RAYONS X, D'UN AGENT TRANS- 



FORMANT DU PNEUMOCOQ.UE 79 



H. Ephrussi-Taylor et R. Latarjet 



RADIATION DEATH IN MAMMALS 81 



B. Rajewsky 

 Discussion .......... 92 



ACTION OF IONIZING RADIATIONS ON CELL CON- 

 STITUENTS 93 



Maurice Errera 



RELATIVE BIOLOGICAL EFFICIENCY OF FAST NEUTRONS 

 AND GAMMA RADIATION FOR CHRONIC IRRADIATION 



OF MICE 104 



R. H. Mole, R. J. Munson and G. J. Neary 

 Discussion . . . . . . . • • .104 



REMARKS CONCERNING SULPHYDRYL PROTECTION 

 AGAINST MAMMALIAN RADIATION INJURY . . .105 



Harvey M. Patt 



LE METABOLISME DE LA CYSTEAMINE . . . .110 



W. G. Verly, G. Koch et S. Gregoire 



STUDIES ON THE MECHANISM OF RADIATION PRO- 

 TECTION AND RECOVERY WITH CYSTEAMINE AND 



p-MERCAPTOETHANOL 112 



Alexander Hollaender and C. O. Doudney 

 Discussion on Papers by Patt, Verly and Hollaender . .116 



OBSERVATIONS ON THE EFFECT OF SPLEEN-SHIELDING 

 AND THE INJECTION OF CELL SUSPENSIONS ON SUR- 

 VIVAL FOLLOWING IRRADIATION . . . .122 

 Leon O. Jacobson, Edna K. Marks and Evelyn O. Gaston 

 Discussion . . ... . . . . • .133 



SPLEEN PROTECTION: THE CELLULAR HYPOTHESIS . 134 

 D. W. H. Barnes and J. F. Loutit 



THE MODIFICATION OF THE RADIATION RESPONSE BY 



SHIELDING PROCEDURES 136 



L. F. Lamerton and E. H. Belcher 

 Discussion . . . . . . . • • .140 



viii 



