278 ARTHUR C. WALTON 



learned, the addition of a third compartment would be much 

 simpler than trying to teach association to all three compart- 

 ments at once. 



The results were extremely successful from the very first, 

 and showed practical mastery of all the phases of the "A," 

 "B" and "C" types immediately. 



" Two Light ' trials were given in condition "A" of the 

 following types, ' Light Constant," ' Light Out at Release," 

 " Two Seconds Delay," ' Five Seconds Delay," ' Ten Seconds 

 Delay," ' Fifteen Seconds Delay" and " Sixty Seconds Delay" 

 with the following results. All these results showed a high per- 

 centage except those on "Five Seconds Light, Fifteen Seconds 

 Delay" when the dog was very fatigued and gave but poor 

 attention at the beginning of the trials. In all cases each 

 series was continued until at least five successive correct 

 trials were made. 



A short summary of the trials is as follows: 



The results for condition "B" which follows in summary, were 

 not so favorable, yet results beyond that of 50% of chance 

 were obtained in all but three series of ten each on 11/17/13, 

 11/19/13 and 12/16/13. On each of these three days the dog 

 showed symptoms of indigestion. These poor days pulled down 

 the general averages for the types in which they occur, but the 

 other records of each corresponding type were high enough to 

 balance up and give a safe margin over the 50% of " Chance." 



