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K. S. LASHLEY 



greatest freedom to the hand most frequently used. Thus No. 1 

 sat with his right side near the side of the cage, leaving his left 

 arm free, and No. 2 kept his right arm and side away from the 

 side of the cage. Interchanging the monkeys in their cages did 

 not seem to interfere with this custom, which seems therefore 

 independent of the relation of the cages to other objects. 



Marked variations in the use of the hands from day to day 

 were noted. Not more than 25 trials in any one situation were 

 given on a single day and in the majority of cases one or the 

 other hand w T as used exclusively in each series of trials unless 

 some disturbing element, such as the alternate use of the ex- 

 perimenter's hands, intervened. 



TABLE 2 



The Preferential Use of the Hands in Defence from Attack by 



the Experimenter 



TRANSFER OF THE EFFECTS OF TRAINING 



When a sufficient number of observations had been obtained 

 to make the relative use of the hands in each situation fairly 

 certain, training for the exclusive use of one hand was begun. 

 An attempt was made to force both of the animals, when leashed 

 to the floor of the room, to use only the left hand in taking 

 food from the experimenter's right hand. The method of train- 

 ing was to withhold the food and to grasp or strike at the mon- 

 key's right hand whenever he extended it to take the food. 

 No. 2 did not take kindly to this training. He would snatch 

 at the food with his right hand, getting it as often as not, and 

 when punished would refuse to reach again. After about 100 



