Cellular Immunity. 



101 



the same toxins at different stages of immunity, the fact that a cellular 

 immunity of such tissues as the muscle of the heart and intestine can be 

 produced is regarded as proved. 



The extent to which different tissues acquire and retain a cellular immunity, 

 beyond and independent of the presence of antitoxin in the serum, and the 

 universality or otherwise of the occurrence of cellular immunity with different 

 toxins requires further investigation. 



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