CANADA PORCUPINE 67 



four minutes were spent near the center e-h. Seventeen minutes 

 were lost between r and 6. The remainder of the time was spent 

 at various places in efforts apparently directed to getting out of 

 the trap in which he found himself. 



Second dsiv. Experiments 2 and 3. Time was greater on 

 the second effort by six minutes than the previous time 

 but there were 13 fewer errors. Greatest difficulty encountered 

 was in j. Although e-h caused little difficulty there was even 

 greater confusion between 6 and r than occurred on the former 

 test. Certain parts seemed to induce hesitation and confusion. 

 The second trial on this day consumed nearly an hour and 25 

 minutes, an increase of nearh' nine minutes with an increase 

 of 30 in the number of errors. There were, however, two out- 

 side distractions which caused serious difficulties by inducing 

 the anigial to retrace his path. 



- Third day. Experiments 4 to 8 inclusive. The five trials 

 on this day were made possible by the fact that the animal 

 materially reduced his time. There was nothing else especially 

 characteristic of the day. On the last trip, he did the last half 

 of the maze in 45 seconds but even then the time was increased 

 from 10 minutes and 45 seconds to 21 minutes and 30 seconds, 

 due to confusion in the first half. 



Fourth day. Experiments 9 to 20 inclusive. The porcu- 

 pine found blind alley 2 and entered it on each of the 12 trips 

 on the fourth day. Next to the discovery of 2 the most import- 

 ant feature was his confusion at r' and r on each of the first six 

 for the day with the subsequent solution so that the last half 

 of the maze was traversed without error. This confusion was 

 interesting from the fact that the two points were similar but 

 required opposite reactions to pass them, confusion probably 

 being due to the mistaken identity of the two positions. The 

 average time for the 12 excursions was 4 minutes and 11 

 seconds. The time for each of the first six was above the aver- 

 age and that for the last six was below the average. It is also 

 significant that the curve of the day is low at the middle with 

 a minimum of 2 minutes and 15 seconds on the ninth trip. 

 The increase in time on the last excursions was probably due 

 to fatigue and partial satiety. 



Fifth day. Experiments 21 to 32 inclusive. Twelve experi- 

 ments were also made on this day. The loth for the day and 



