682 WILLIAM J. ARNOLD 



may have affected mouth and throat tissue, possibly complicating radiation 

 sickness and its sequelae. The new technique utilizes a horizontal beam 

 which minimizes the dosage to mouth and throat tissues. With the new 

 technique, it is planned to investigate the effects of dosages of 5,000 r or 

 less after longer periods. 



References 



Arnold, W. J. 1952. Maze learning and retention after x-radiation of the head. 



/. Comp. and Physiol. Psychol. 45, 358-361. 

 Blair, W. C. 1958. The effects of cranial x-radiation on maze acquisition in rats. 



/. Comp. and Physiol. Psychol. 51, 175-177. 

 Blair, W. C, and Arnold, W. J. 1956. The effects of cranial x-radiation on retention 



of maze learning in rats. /. Comp. and Physiol. Psychol. 49, 525-528. 

 Koronakos, C, and Arnold, W. J. 1957. The formation of learning sets in rats. 



/. Comp. and Physiol. Psychol. 50, 11-14. 



