146 



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



Table I 



Results of Tests for Strain-A Antigen in Tissues and Tissue-fluids 



From CBA Mice Irradiated with 950 r X-rays and Promptly Injected 



Intravenously with a Suspension of Strain-A Spleen. 



Fractions indicate the number of positive results out of the total. 



persist and perhaps multiply in the unirradiated CBA 

 mouse for a few days only. 



In ancillary experiments it was demonstrated that the 

 critical dose of materials from mice of strain A to give positive 

 results was: peritoneal exudate, 10^ cells; suspension of spleen, 

 10^ cells. It is possible that the trauma to cells attendant on 



Table II 



Results of Tests for Strain-A Antigen in Tissues and Tissue-fluids 

 FROM Unirradiated CBA Mice Injected Intravenously with a Suspen- 

 sion OF Strain-A Spleen 



Fractions indicate the number of positive results out of the total. 



