42 'Journal of Comparative Neurology arid Psychology. 



These times, as before, are expressed in fractions of a minute. 

 The normal time was secured by averaging a number of trial 

 records taken immediately before Experiment I was made. 



TABLE II. 



Average time for running the lengthened form of maze after becoming habituated to shortened form. 



{Based upon J animals.) 



Normal .28 min. (3) .52111111. (6) .34min. 



(0 -59 •■ (4) -31 " (7) -35 ■' 



(i)' -65 " (S) -49 " (8) .34 •■ 



As the best description of their behavior, we give as typical the 

 record of Male I for eight successive trials. 



Oct. 2. (i) Came to a full stop at Qf and "nosed'' along the wall. Ran into and traversed the 

 full length of alleys B, G and H. 



(2) Slowed up at Q'. Entered B its full length. On coming out of B, ran back into A. started 

 from A in the right direction, slowed up at Q' and partly entered B, G and H. 



(3) Turned into the wall at Q' and became badly confused. Ran back and forth between Qf and 

 A three times. On coming to Q' the third time, reared upon the wall and "nosed'' about. A slight 

 error was made at B. Ran the full length of G and made a slight error at H. 



(4) Ran rapidly to Q' and then went slowly until turning the corner. Ran past B but hesitated 

 at G and H. 



Oct. 2. (5) "Nosed'' along the wall at Q' until turning the corner. Slowed up at B, ran with 

 full speed against the end of G and partially entered H. 



(6) Ran past Q' correctly, and went into B its full length. On coming out of B, went back to A, 

 started from A in the right direction, and "nosed'' around the wall at Q', went back again to A, turned 

 and came to Q' and "nosed'' about; continued but hesitated at B, G and H but did not enter them. 



(7) Slight hesitancy at B and H. 



(8) Merely slowed up at Q', B and H. 



All the annuals ran into the wall at Q' and into all of the crucial 

 cul-de-sacs. These errors had been eliminated to a great extent 

 by the end of the first four trials (first day's experience), but were 

 again prominent during the first trials of the second and third 

 days. On etitermg the crucial cul-de-sacs, the rats frequently ran 

 full speed into the end of the alley. This is evidence that the cul-de- 

 sacs were mistaken for the true pathway. After a few trials, the 

 cul-de-sacs were entered only part way, and finally the disturbance 

 manifested at these positions consisted of hesitations or of a swerve 

 in the direction of the openings without any decrease in speed. 

 At first, the rats actually attempted to turn through the wall at 

 Q^ at the definite position at which they would have had to turn 

 in the shortened maze. Striking the wall at an angle, the rat would 

 slide along it for eight to ten inches and would then go on until it 

 stumbled upon the opening at the end of the alley. This turn 

 occurred relatively accurately (/. e., with respect to old habit) 

 during the first five trials on the average. After this number had 



