96 



EUPHA FOLEY TUGMAN 



(b) Comparison of results. Table VI shows a summary of 

 the results for each bird. The first column gives the difference 

 in intensity (c.p. Hefner units) between the standard and the 

 variable lights in the decreasing series. The third column gives 

 the number of trials it took each bird to learn to discriminate 

 the lights at each position. The fourth column gives the number 

 of correct choices and the sixth column gives the number of 

 incorrect choices. The last gives the percentage of error of each 

 bird for each intensity. 



TABLE VI 



Summary of results for each bird. Male IV and Female V chose brighter light 

 Male V and Female VI chose darker light. Male V began discrimination with lights 

 nearer together than did the other birds. 



