DISCUSSION 



Dr. Hoffman: I am a littlr puzzled about this because although spleen is packed 

 with myeloid clement in the mouse, I think these are absent in most other laboratory 

 animals. I think they are absent in the rabbit, I do not think there arc any myeloid 

 elements in the rabbit's spleen? 



Dr. George : I do not know. 



Dr. Hoffman: The second point is with regard to the aspect you mentioned very 

 briefly — that you have not yet gone into the problem of secondary disease. I again 

 wonder, rather than assert, are there any sufficiently inbred strains of rabbits available 

 to permit isologous transplantation? 



Dr. George: Oh yes, thank you ! I did not mention that these were ordinary labo- 

 ratory bred rabbits, they were not of any particular strain. There were no isologous 

 transfusions, these were all homologous. 



67 



