ANIMA L INTELLIGENCE. 



29 



When in this table the letters desif^naim- mc oo.xes are 

 in italics it means that, though the cat formed the association, 

 it was in connection with other experiments and so is not re- 

 corded in the curves. 



The advantage due to experience in our experiments is not, 

 however, the same as ordinarily in the case of trained animals. 

 With them the associations are with the acts or voice of man or 

 with sense impressions to which they naturally do not attend (c. ij'., 

 figures on a blackboard, ringing of a bell, some act of another 

 animal). Here the advantage of experience is mainly due to 

 the fact that by such experience the animals gain the habit of at- 

 tending to the master's face and voice and acts and to sense im- 

 pressions in general. 



I made no attempt to find the differences in ability to acquire 

 associations due to age or sex or fatigue or circumstances of 

 any sort. By simply finding the average slope in the different 

 cases to be compared, one can easily demonstrate any such 

 differences that exist. So far as this discovery is profitable, 

 investigation along this line ought now to go on without delav, 

 the method being made clear. Of differences due to difference 

 in the species, genus, etc. Of the animals I will speak after 

 reviewing the time-curves of dogs and chicks. 



In the present state of animal psychology there is another 



