The Efficiency of Training Methods 245 



establishment of a white-black discrimination habit. That 

 this method was not applied to ten individuals as were the 

 two-five-test, the ten-test, and the twenty-test methods is due 

 to the fact that it proved practically inadvisable to continue 

 the tests long enough to complete the experiment. I have 

 usually designated the method as one hundred or more 

 tests daily. I applied this training method first to individuals 

 Nos. 51 and 60. At the end of one hundred and twenty 

 tests with each of these individuals I was forced to discontinue 

 the experiment for the day because of the approach of dark- 

 ness. In the table the end of a series for the day is indicated 

 by a heavy line. The following day Nos. 51 and 60 succeeded 

 in acquiring a perfect habit after a few more tests. 



TABLE 45 



EFFICIENCY OF TRAINING. WHITE-BLACK TESTS AT THE RATE OF 

 100 OR MORE PER DAY 



1 Age of No. 51, 22 weeks. Age of No. 60, 17 weeks. Age of No. 87, 



weeks. 



