738 



W. LYNN BROWN AND ARNOLD A. McDOWELL 



MALE 

 FEMALE 



Fig. 7. Proportions of total object responses directed by the 5*8 of each sex to each 

 of the four stimulus classes in the free cage environment. 



delayed response testing for the two sexes. The prediction proved valid. 

 The females improved significantly faster than males. 



In a second group of 64 rhesus monkeys, 56 had been exposed to nuclear 

 radiations at the Nevada Test Site. The number of each sex in each sub- 

 group and the radiation dosages are shown in Table II. For statistical 

 analysis, the control group and radiation subgroups I and J constituted the 



TABLE II 

 Dose Levels for and Number of Subjects of Each Sex in Each Subgroup 



