284 



ARTHUR C. WALTON 



part and the dog refused to even leave the release box on the 

 opening of the door. On command the routine part would 

 be resumed, but correct reactions, or even attempts at choosing 

 did not follow such commands. Hunger also caused attention 

 to vary. When very hungry, the dog was in good attention 

 and gave good results, and vice-versa. 



Another interesting factor in regard to the preference for 

 any certain compartment was found in the records. A sum- 

 mary will give a better idea of this preference than can the 

 mere description above. 



TRAINING TRIALS 



