Movement-odor Association. 



A watch glass covered with a perforated sheet of zinc 

 was placed at the end of the long passage at which point the 

 Guinea pig had to choose between the right and left turns. 

 When the left door was open the watch-glass contained a 

 piece of absorbent cotton saturated with oil of peppermint. 

 When the right door was open this watch-glass was replaced 

 by another containing tincture of assafoedita. Care was 

 taken that the two watch-glasses should offer the same visual 

 appearance and also that the maze should be well aired be- 

 tween each change. As the time of the turning reaction was 

 so largely dependent on the pig's state of hunger and fatigue 

 the measurement was of right and wrong cases only, no record 

 being taken of the time. 



At first twenty-four series of three trials each were 

 taken, the odors and the unlocked doorways being alternated 

 every three trials. The Guinea pig was considered to have 

 failed in every trial in which he tried the locked doorway. 

 No punishment was used at the locked door. 



Considering the first six series and the last six series 

 under each of the two conditions, making groups of eighteen 

 trials each, the results were as follows: 



Peppermint and Left Turn Per cent of Right Cases 



First six series 55.5 



Second six series 38.8 



Average 47.15 



Assafoedita and Right Turn Percent of Right Cases 



First six series 44.4 



Second six series 50. 



Average 47.7 



Average of all 72 trials 47.4 



The above series extended through two weeks. During 

 the next eight days seventy-two more trials were taken, 

 equally distributed between the two conditions, that is, be- 

 tween the occurrence of assafoedita and the open right door 

 and peppermint and the open left door. In these trials a 

 random order of presenting the conditions was used, but the 

 same set of conditions never occurred more than twice con- 

 secutively. The results were as follows: 



SEVENTEEN] 



