272 ARTHUR C. WALTON 



apt to have a distracting effect on the dog's attention and thus 

 tend to drive away the memory of the proper association. The 

 records from these experiments were taken as satisfactory proof 

 of the question as to whether the belief in such a probability 

 was well founded. The release box had to be turned rather 

 quickly in order to disturb the orientation of the dog within the 

 box, as well as to disturb the entire orientation toward the 

 food compartments. The preceding observations had borne 

 out the statement of Hunter (13), that the dog showed orien- 

 tation only by the movement of the head, and that causing 

 the head to change its position would effectively destroy the 

 dog's orientation. The sharp turn of the release box affected 

 this disturbance of orientation, for the dog was forced to move 

 the whole body in order to maintain his equilibrium. Under 

 these new conditions, no evidence was seen of the tense, eager 

 waiting that the dog had formerly displayed during the delay 

 period, and the dog even used the time for scratching at fleas, 

 and during the longer delays would close his eyes and apparently 

 take little cat-naps while waiting. As soon, however, as he felt 

 the release box return to the normal position, he was wide awake and 

 eager, and hurried out of the door before it was fairly opened. 



The experiments are recorded under the two heads "CI" 

 and "C2" differing as before, in the manner of placing the food 

 reward. The records began with the minimal delay of five 

 seconds after a five seconds light stimulus. 



Five Seconds Delay. CI — Only fifteen trials of this type were 

 given, as evidence of a breakdown on No. 3 compartment ap- 

 peared and a return to an "A" type of experiment was necessi- 

 tated. The results of the fifteen trials was nine correct reactions. 

 Of the five trials on No. 3 compartment, all were wrong. 

 Only one of the five trials on No. 2 compartment was a wrong 

 reaction. At this time, November 4th-8th, 1913, the aversion 

 or loss of cues to No. 3 was noticed in all the sets of experiments 

 then going on, and so the series of check trials described under 

 condition "A" was given. After this series the dog regained 

 his cues to No. 3 and went there as readily as to any other 

 compartment. 



Ten Seconds Delay. C2 — On January 22nd, 1914, the "C2' : 

 experiments were taken up again after the dog had had a month 

 and a half's training in all the conditions including "AD" and 



