'*«W«S9^- 



Fig. 7 a. A low power (H. & E. X 6.5) photomicrograph of the irradiated portion 

 of the brain from a companion monkey to that shown in Fig. 6A. The animal was 

 killed 24 hours after irradiation with 11,000 rad. The width and position of the beam 

 is indicated. There was a 6-mm wide band of intense (4+) fluorescence extending 

 34 of the way to the bottom of the section in the fresh specimen. The photograph 

 illustrates the isolated patches of lightly stained tissue seen in the gray matter and the 

 mottled appearance of the white matter in the path of the beam. 



Fig. 7B. Lightly staining patches in the gray matter enlarged 24 times. By 48 hours 

 the entire irradiated area had become liquescent. 



377 



