RADIATION AND AUDIOGENIC SEIZURES IN MICE 



519 



SHiV30 JO % 



Fig. 1. Latency of fatal audiogenic seizures in Fi male mice. Comparison, durmg 

 two periods, of latency in controls and groups irradiated at 350 mrad per day. Mice 

 were born on the dates indicated and were tested 30 days later. Low background 

 prevailed from December. 1956 to April. 1957. From April, 1957. to October, 1957, 

 the background was considerably higher. 



