112 



V INN IK C. HICKS AND J I. A. CARR 



curves of the adults and rats occupy the two extremes. The 

 curve of the children is a mean, but it approximates more 

 closely the adult curve than it does that of the animals. 



The independent variability of error and distance can have 

 but one meaning, when one considers the unit of error adopted 



Ar cent 



700 / 



600 



500 



100 



300 



/\ 



/ 



\m/ 



/ 



I 



I 



Trials 



Figure (5. Time and Distance Comparison. Graphs representing the speed of 

 running, or the rate at which distance is decreased in relation to time. Rise 

 of curve indicates that time has been decreased faster than distance. A, 

 adidt curve; C, children's curve; R I, animal curve. 



in this experiment. Entrance into an alley constitutes an error, 

 irrespective of the distance entered. At first the alleys are 

 traversed throughout their entire length. In the later trials, 

 the alley is only partially explored, this being sufficient to 

 identify the runway as a mistake. One error is counted in each 

 case, but the distance traversed is much smaller in the second 



