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JANSSEN ET AL. 





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Fig. 10. Alpha particle radiation, 6,000 rad surface dose. Cajal preparations of 

 cerebellum. A. (9 days) Above the line separating irradiated from nonirradiated cortex, 

 the cerebellar tissue has lost its affinity for the gold chloride. Beneath this line, many 

 enlarged astrocytes are to be seen in the granular layer, and Bergmann cells have 

 undergone hypertrophy. X80. B. (10 days) The hypertrophied Bergmann cells are to 

 be seen to better advantage. X 150. 



became apparent ; within the band the astrocyte.s were undergoing distinte- 

 gration. At 5 days, astrocytes had disappeared from the band and some 

 above the band were in a state of advanced distintegration (Fig. IIA). Im- 

 mediately beneath the band, the astrocytes were strikingly hypertrophic and 



