DISCUSSION 



Dr. George : I did not quite catch how you gave marrow to the mice, did you give 

 it in one shot, or two or three? 



Dr. Vogel: It was given in a single shot within a few hours after radiation, intra- 

 venously through a tail vein. The contents of both femurs, from another mouse, in 

 Tyrode's solution were given in each shot. 



Dr. Gray: Is it not true that cysteine gives better protection against y-rays than 

 fission neutrons ? 



Dr. Vogel : Yes, on the whole as I recall it, for y-rays it is down by about 15 per cent, 

 for neutrons by about 8 per cent. 



Dr. Gray: That is a two to one drop in mortality? 



Dr. Vogel: No, this refers to dose. This would be the effective dose reduction — 15 

 per cent for the y-rays and about 8 per cent for the fission neutrons. 



Dr. Loutit : Have you any observations on the bacteraemia of these mice treated 

 with bone marrow? 



Dr. Vogel: No, but this would be a productive course of investigation. 



235 



