326 Journal of Coiiiparathe Xeurology and Psychology. 



The paths taken by each individual were preserved by the 

 smoked paper. The most interesting points which the smoked 

 paper shows are two : (i) Tlie number of motions on the part 

 of the adult as compared with the young is much smaller, and 

 are less free. (2) There is a tendency on the part of the 

 adult to keep as close as possible to the wire. 



The early movements are different from the adult in kind 

 as well as in number and freedom ; the jumping movements 

 mentioned previously are soon lost. 



The adult guinea pigs have a peculiar and characteristic 

 method of sneaking across an open space, or of stealing up on 

 food and snatching it back into an imagined retreat. Domesti- 

 cation partially removes this fear of being seen, and the move- 

 ment does not develop early or strongly in the laboratory young. 

 I think it probable that the "agora-phobia" is an acquired 

 characteristic, or an instinct which, in accordance with James' 

 "law of transitoriness," has lacked fixation by habit, and so 

 has faded away.^ 



The typical series of reactions to the labyrinth was com- 

 pleted March 5. On April 20 the same guinea pig was given 

 the same problem, having been free from experiment during 

 the interval. Conditions of hunger were the same as those 

 previously obtaining. 



Time required for the solution, i min. Some time was 

 lost in exploring the cage, but after once entering the labyrinth 

 only .3 min. elapsed before the food was found. Each turn 

 was made accurately, showing perfect familiarity with the path- 

 way. Two blind passages were barely entered. 



April 22, a day having been omitted to preserve the food 

 conditions constant, the times were (1) .33 min. (2) .33 min. 



April 24, time, .166 min. 



Therefore we conclude from the eliminition of random 

 movements and from the short time required, that the recollec- 

 tion of the problem persists at least 48 da\ s. undiminished in 

 its efficiency. 



1 Principles of Psychology, Vol. 11, pp. 39S-402 



