144 SHEPHERD IVORY FRANZ 



used 1 8 times for both pieces (total 36), the left hand 55 times 

 (total no), and both hands 2 (2 each). In the test in which 

 the single pieces of food were taken the right hand was used 

 for 15 pieces of food on the right and 17 on the left; the left 

 hand 74 times for food on the right and yq times for the food 

 on the left. Although there is a slight difference in favor of 

 taking the food on the left, the percentage is almost equal for 

 both hands, and there is no apparent influence in this case of 

 the position of food affecting the use of either hand. 



The positions of the pieces of food in the tests with mon- 

 keys 2, 3, 6 and 7 were not noted on the records, and no data 

 in regard to this matter can be given. 



During the tests it was repeatedly noted that there were 

 relatively long periods when each animal would use exclusively 

 one hand in taking the pieces of food, followed by a period 

 when the other hand was used. In a long series these alterna- 

 tions, if due to extraneous causes, should balance, but in the 

 cases of monkeys 1, 6 and 8 after operation the series were 

 not sufficiently long. 



Although the data collected indicate as a whole that of six 

 monkeys one show T ed an apparent preference for the use of 

 the right hand (monkey 1), and two preference for the use of 

 the left hand (monkeys 3 and 8), more observations are needed 

 before any definite preferential use of the hands in monkeys 

 may be accepted as proven. In view of the relation of the 

 observations to the question of the origin of right or left hand- 

 edness in man, the data are here given in the hope that other 

 workers with monkeys may be tempted to make similar obser- 

 vations and publish their results. 



