DISCUSSION 

 REFERENCES 



^Taliaferro, W. H. and Taliaferro, Lucy E. /. Immunol. 16 (1951) 181 

 2SIMONSEN, M. Acta path, microbiol. scand. 40 (1957) 480 

 ^Burnet, F. M. Aust. J. Sci. 20 (1957) 67 



^Lederberg, J. /. cell. comp. Physiol., Supplement to Vol. 52 — in press 

 ^DixoN, F.J. and Weigle, W. O. /. exp. Med. 105 (1957) 75 

 ^NossAL, G.J. V. Immunology, 1959 — in press 



^Barnes, D. W. H., Ford, C. E., Ilbery, P. L. T. and Loutit, J. F. Transplantation 

 Bull. 5 (1958) 101 

 ^SiMONSEN, M. Acta path, microbiol. scand. 39 (1956) 21 

 9NOSSAL, G.J. V. Aust. J. exp. Biol. med. Sci. 36 (1958) 235 

 "Medawar, p. B. et al., Proc. roy. Soc. B 146 (1956) 1 



DISCUSSION 



Dr. Loutit: I was intrigued by this idea of the effect of the adult's environment on 

 immature cells. This made me wonder whether the experiments have been con- 

 trolled by introducing the immature cells into the immature normal or immature 

 irradiated animals to see if they responded in exactly the same way as they do in the 

 adult, or in a diff"erent way. 



Dr. Nossal: Yes, we have performed this control, and introduction of immature 

 into immature normal, and immature into immature X-irradiated never caused the 

 formation of antibody. 



243 



