22 



L. W. SACKETT 



presented the food with his own right hand. In table II the 

 plus sign indicates that the animal was correct in reaching 

 with the left hand, while the minus sign indicates errors in 

 reaching with the right hand. The tests were made in series 

 of 20 without any appreciable pause between tests or series. 



. "! TABLE II 



+ +— +— + 



+ —+—+—+ + + —+ + 

 + h + + +— + + + 



+ + + + + + + + + + + + 



Nothing could be clearer than the progress with which adap- 

 tation is made to the new demands. It was a simple case of 

 solving the problem of how to obtain food. In 2024 tests No. 

 3 made 54 errors, 30 of which were made in the first 100 as 

 shown in the table. 



When the animal had attained perfection in this line the 

 experiment was narrowed down to the real problem of teaching 

 him to reach for cabbage with his right hand and for carrot 

 with his left hand, although the experimenter still presented 

 food to him with the right hand in the same manner each time, 

 and with each kind of food. Table III gives detailed results 

 of the experiment. 



TABLE III 



Table III shows: (1) The number of morsels of each kind of food given the 

 animal before changing; (2) the number of changes made each day; (3) the failure 

 of the animal to change hands right to left and left to right with change of the 

 food stimulus from cabbage to carrot and carrot to cabbage; (4) the errors w^hich 

 he made in changing his hands when there was no change in the food stimulus; 

 (5) the total number of errors; and (6) the total number of tests each day. 



