300 ALDA GRACE BARBER 



* On these days controls were put in, but as they did not affect the rats' reactions 

 the trials were considered standard. 



The high average of No. 23 on the 10th day was doubtlessly 

 caused by the noise in the laboratory resulting from an electric 

 storm. One bad reaction of No. 22 on the 13th day, accounts 

 for the high average, for the other reactions were up to standard. 

 The average for No. 21 on the 12th day can be accounted for 

 in a similar manner. 



Throughout the tests the responses of the rats never became 

 automatic. If a curve were plotted of these normal responses, 

 it would show marked irregularities throughout its course. 

 This, contrasts with the regularity of the ordinary maze co- 

 ordination in rodents — a motor or kinaesthetic habit. 4 Other 

 investigators working with other problems have noted a similar 

 irregularity in certain sensory habits. For example Vincent 5 in 

 studying the ability of the white rat to learn the maze problem 

 when olfactory and visual stimuli had been added and utilized 

 secured results of this type. Watson 6 and Hunter 7 point out 

 a similar lack of automaticity in the maze habits of birds. A 



4 Watson, J. B. Kinaesthetic and Organic Sensations. Psych. Rev. Mon., vol. 

 7, No. 2, 1907. 



5 Vincent, S. B. Some Sensory Factors in the Maze. Psych. Bull., vol. 10, 

 p. 67, 1913. 



6 Watson, J. B. The Behavior of Noddy and Sooty Terns. Carneg. Inst. Publ., 

 No. 103, 1909. 



7 Hunter, W. S. Some Labyrinth Habits of the Domestic Pigeon. Jour Animal 

 Behav., vol. 1, 1911. 



