138 Animal Intelligence 
/ 
PERMANENCE OF ASSOCIATIONS 
Once formed, the connections by which, when an animal 
feels a certain sense-impression, he does a certain thing, 
, persist over considerable intervals of time. With the curves 
on pages 39 to 58 and 60 to 65 are given in many instances + 
additional curves showing the animal’s proficiency after an 
interval without experience. To these data may be added 
the following :— 
The three chicks that had learned to escape through 
the long labyrinth (involving twenty-three associations) 
succeeded in repeating the performance after ten days’ 
interval. Similarly the chicks used as imitators in V, W, X 
and Y did not fail to perform the proper act after an in- 
terval of twenty days. Cat 6,who had had about a hundred 
experiences in C (button), had the association as perfect after 
twenty days as when it left off. Cat 2, who had had 36 ex- 
periences with C and had attained a constant time of 8 sec- 
onds, escaped fourteen days later in 3, 9 and 8 seconds, re- 
spectively, in three trials.) Cat 1, after an interval of twenty 
days, failed in 10 minutes to escape from C. The signal 
for climbing up the front of the cage was reacted to by No. 3 
after an interval of twenty-four days. No. 10, who had 
learned to discriminate between ‘I must feed those cats’ 
and ‘T will not feed them,’ was tried after eighty days. It 
was given 50 trials with the second signal mingled indiscrim- 
inately with 25 trials with the first. I give the full record of 
these, ‘yes’ equalling a trial in which she ‘forgot’ and 
climbed up, ‘no’ equalling a trial in which she wisely stayed 
down. Dashes represent intervening trials with the first 
1See roin A, 3in A, roinD; roinC,4inC,3inC; 6,2,5,4in E; 4in 
F; roinH,3in H; 3,4,5,inI; 4inG,3inG;3inK; 1oinL; dogrinN 
and CC; dog1in Gand O. 
