Fig. 13. Earlier stage of radionecrosis in the brain of a Syrian hamster, 24 hours 

 after the local application of 20,000 r. The tangentially situated zone of clear necrosis 

 has a spongy character and is demarcated by a strip of even more pronounced spongi- 

 ness. Azan stain. 



• ^ 



% «.. » 



«>' 



«i * 



Fig. 14. The same case as in Fig. 13. In the necrotic zone, the cellular constituents 

 can scarcely be diflferentiated, with only a few exceptions. The plasma has become un- 

 stainable : the nuclei are pyknotic. Some emieiated polymorphonuclear leucocyte;, are 

 also seen. Gallocyanin. 



222 



