552 Journal of Comparative Neurology and Psychology. 



to top of cage ; tried to open door from top of box ; climbed off box, tried door, 

 went completely around box and tvorked at door again ; thence to south side, 

 and back to door and then around box again. Finally left problem-box. 

 Climbed back on top, then off over string and to door ; went back on top once 

 more, bit at wire netting of cage enclosing problem-box ; went around north 

 side, and then back to box ; nosed string ; played with string, then came to 

 south side, tried door, sat and gnawed at wood for two minutes. Stopped ; 

 ran around cage several times and went to door again ; bit at nail in corner 

 of .box; then climbed on top, pulled and bit at string while there until the 

 door came open. Did not notice that door was open and continued to tear 

 at string and pull and tug at wire netting for one minute. Entered, time: 

 19-15 min. 



Aug. 1, '07, 12 M. Male No. 2 (trained), second trial: Sratched at north 

 side ; at back ; ran on top, down to south side ; looked around ; drank water 

 out of a vessel in corner of large cage ; ran over top of box and scratched 

 at door ; worked very hard here for almost a minute ; scratched at north side. 

 Pulled and tugged at wire netting on top of cage near the point where string 

 was passed through ; examined floor of large cage and scratched at door of 

 problem-box ; ran around box, listened, ran around again, listened ; scratched 

 at door and then at south corner, listened, etc. Stopped work after 61 min- 

 utes and refused to start again. 



Squirrel No. 1. male (untrained), second trial: Touched door with nose, and 

 then ran around box ; ran over top of box ; repeated this five or six times, 

 trying door each time as he passed it. At intervals would run all over large 

 cage. No scratching or working at door, simply touched it or tried to enter, 

 as if door were open. Time: 4.18 minutes. 



Squirrel No. 4, female (untrained), second trial : Ran around box, then over 

 it five or six times; tried door twice; touched string several times in running 

 over the box ; pulled string, gave two tugs ; opened it and jumped from box 

 and ran into food. Time : 2.91 minutes. 



It will be seen from these notes that the trained squirrels Nos. 2 

 and 3 both attempted to enter by biting and scratching at the door 

 and by scratching sawdust, sticks and shavings away from the 

 bottom of the problem-box on all four sides. The movements 

 throughout were evidently those of the early learning processes. 

 The notes also show individual differences quite plainly. Both had 

 learned the two boxes, the sawdust and outside latch boxes. The 

 tendency of No. 3, the female, was to bite and scratch at the door 

 as she had done in learning the outside latch problem. In her work 

 there was very little and, after a few slight attempts, no scratching 

 of the sawdust at the bottom of the box. On the other hand, the 

 male did not carry over the movements learned in his work upon 



