252 



F. STEPHEN VOGEL 



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Fig. la. Granular layer of the cerebellum of a normal dog. The granule cells have 

 uniform, rounded nuclei with a nucleolus and fine chromatin material, but no visible 

 cytoplasm. Hematoxylin and eosin stain. X 400. 







Fig. lb. Granular layer of a dog 15 hours after exposure of the head to 15,000 r 

 of gamma radiation from a Co'" source. Many nuclei are shrunken and hypcrchro- 

 matic. Some show karyorrhexis. Hematoxylin and eosin stain. X 400. 



