CONTENTS IX 



PAGE 

 The factor of immunization: clonal selection theory investigated 

 by spleen assays of graft-versus-host reaction 



&y M. SiMONSEN 185 



Discussion: Amos, Brent, Eichwald, Hildemann, G. Klein, Loutit, 

 Medawar, Michie, Mitchison, Silvers, Simonsen, Voisin, 

 Woodruff , 210 



Further studies on interactions between sessile and humoral anti- 

 bodies in homograft reactions 



by]. R. Batchelor and M. S. Silverman .... 216 



Discussion: Barrett, Batchelor, Billingham, Brent, Feldman, 

 Lawrence, Medawar, Mitchison 231 



Immunological competence of small lymphocytes in the graft- 

 versus-host reaction in mice 



/;y W. H. Hildemann, W. D. LiNSCOTT and M.J. Morlino . 236 

 Discussion: Billingham, Brent, Eichwald, Hildemann, Loutit, 

 Medawar, Michie, Miller, NAKid, Russell, Silvers, Simonsen, 

 Woodruff 264 



Homograft sensitivity in human beings 



by H. S. Lawrence, F. T. Rapaport, J. M. Converse and W. S. 

 TiLLETT .......... 271 



Discussion: Brent, Converse, Lawrence, Medawar, Silvers . . 282 



Protection against runting by specific treatment of newborn mice, 

 followed by increased tolerance 



by G. A. Voisin and R. Kinsky 286 



Discussion: Billingham, Krohn, Medawar, Michie, Miller, Nakic, 

 Russell, Voisin 326 



Induction of specific tolerance in adult rats by the method of 

 parabiosis 



by B. Nakic, A. KaStelan and N. Avdalovic .... 328 



Discussion: Medawar, Nakic, Silvers, Voisin, Woodruff . . . 343 



Modification of runt disease in mice by various means 



6y P. S. Russell . . . . , . . . .350 



Discussion: Billingham, Brent, Hasek, Hildemann, Medawar, 

 Michie, Mitchison, Nakic, Russell, Simonsen, Voisin . .378 



Role of the thymus in transplantation tolerance and immunity 



by]. F. A. P. Miller 384 



Discussion: Barnes, Barrett, Billingham, Brent, Hildemann, G. Klein, 

 Krohn, Loutit, Medawar, Miller, Mitchison, Voisin, 

 Woodruff 397 



8 n R fi fi 



