282 ARTHUR C. WALTON 



at the same height from the floor as in the other three com- 

 partments. In order to quickly teach the dog the habit of 

 going to No. 4 compartment, and to climb the inclined board 

 without fear, the operators "put" the dog through the reaction. 

 That is, one held a piece of meat at the top of the incline and 

 called the dog. The other experimenter led and pushed the 

 dog up the incline. After four trials, in which he was helped, 

 the dog ran freely up the incline when called, without showing 

 any signs of fear. Then three trials were given in which both 

 light and voice were used as stimuli and the dog released 

 immediately from the release box. Each one of these trials 

 was successful. Next, three trials w r ere given in which the 

 light alone was the stimulus, it being removed as the dog was 

 released. These three trials were all correct. From this point 

 the regular procedure of the experiments was taken up again. 

 Five trials of "Five Seconds Delay," position "C3" were given 

 on February 6th, 1914 and all were correctly reacted to. On 

 the same day series in "Ten Seconds," "Fifteen Seconds" and 

 "Thirty Seconds Delay" were given, all in condition "C3." 

 Of the ten seconds delay, five trials were all correct, as also 

 were five trials of fifteen seconds delay. On February 17th, 

 1914 a series of nine trials of twenty seconds delay was given, 

 of which seven or 76-2/3% were correct. The last five trials 

 were correct. On four different days, series of trials of "Thirty 

 Seconds Delay" were given and the record for the last day 

 showed very great improvement, over those of the preceding 

 ones. In the last three series, five successive correct reactions 

 were obtained before any longer delay was attempted. The first 

 day the dog broke down entirely on No. 3 compartment and a 

 shorter delay had to be used. The records for the four days 

 are as follows: 



2/16/14 9 trials 4 correct 45% 



2/17/14 14 trials 9 correct 64% Last 5 trials 100% 



2/19/14 6 trials 5 correct 83% Last 5 trials 100% 



2/21/14 9 trials 8 correct 89% Last 5 trials 100% 



Encouraged by these results, on February 17th, 19th and 21st, 

 series of trials on "Forty-five Seconds Delay" were given. On 

 February 17th, five trials were all correct. On February 19th, 

 the last five of seven trials were correct, giving a percentage 



