50 FREDERICK S. BREED 



In table 9 are presented the results obtaine {rom chick 

 no. 9 under conditions exactly similar to those under which 

 no. 7 was tested. No. 9, how^ever, was trained to accept white 

 and reject black. 



TABLE 9 

 White-Black Reactions 

 Chick no. 9. Hatched 12/10, '07. Sex F. 

 Series Date Right Wrong 



1 



2 \... 



3 



4 



5 



6 



7 



8 



Now, if some animals were going to require, as no. 8, 310 

 tests besides preference trials to complete the black-white train- 

 ing, working with this habit would consume too much of the 

 experimenter's time. An objection to the white-black habit lay 

 in the preference prior to training that chicks showed for the 

 white. If a combination of visual stimuli could be discovered 

 for neither of which the chicks showed any marked preference, 

 such a combination would commend itself for use, provided the 

 time required to form the desired habit of reaction should be 

 fairly uniform among different chicks and conveniently short. 

 The combination, orange and white, was tried with the result 

 shown in table 10. The work of chick no. 12 was devoid of 

 the irregularities spoken of above. 



TABLE 10 

 Orange-White Reactions 

 Chick no. 12, Hatched 12/10, '07. Sex, F. 

 Series Date Right Wrong 



AandB Jan. 29 11 9 



1 " 30 6 4 



2 " 31 6 4 



3 Feb. 1 10 



4 " 3 9 1 



5 " 4 9 1 



6 " 5 10 



7 " 6 10 



8 " 7 10 



