426 'Journal of Coynparaiive Neurology and Psychology. 



In the lower part of board B, G cm. from the floor, was a circular opening, 

 L, 5 cm. in diameter. On the outside of the board was a square chute 

 (fig. 12, fl), the bottom of which, h, was level with the bottom of the circular 

 opening, L. In the chute, a little way above the opening, was a trap door, c, 

 which could be opened by a lever, d, to which could be fastened any one of 

 the seven strings above described. In tliis experiment, string 2 was so 

 attached. By pulling this string the animal on the inside of the cage 

 could open the trap door in the chute and thus cause the food on the door 

 to fall to the bottom of the chute or roll out into the cage through the 

 opening in Iioard B. In either case the monkey could get it. 



B. Behavior of No. 13. 



PrcUminanj trials. — First trial, August 14. When No. 13 enetred the cage 

 he went at once to L and looked at the opening. He then went to 6Jc and, 

 taking it in his hand, bit it, dropping it after the first bite. Recrossing to Ik 

 lie did the same thing, immediately afterward climbing the wire end of the 

 cage. Returning to the floor he went to 5 and to L, thence crossing the 

 floor to 6, biting Ok and recrossing to 2k and biting it. He then moved 

 about as follows: up the wire; around to 6; back to 1; on the wire; to the 

 . floor; to 2k and bit; thrust his hand into L; to 5k and bit; to Jfk and bit; 

 to the small door and pushed; to 7fc and bit; to 2 and started to climb, 

 but turned his attention to 1 and 3; thrust his hand into L; to the door and 

 to .'j ; across to 7 and up the wire to X. The time for the above described 

 behavior was four minutes. 



He then continued as follows: perched at A',- to the floor; to the door and 

 chewed the edges; up to A' and perched; to the floor; thrust hand into L; 

 up to A^ perched and played with 7 ; to 1 ; back to 7 and to the floor ; to 6 

 and looked at it; around to L and looked; on around to 7 and up to X; to the 

 floor ; to 5 ; up to the top of the cage and examined the hole in the top ; 

 to the floor; to 4 and to 7; up to X; to the floor, the door, and back to 

 X; pulled 7 up to him; about the wire front; to the floor and about the floor 

 to 3k, which he took in his hand; up to X: to the floor; to the door and car- 

 ried 6k up to X; to the floor and to 27c; carried 2k in his hand up to X 

 and looked it over ; then to the floor and around the cage to 5, 4, 3, and 2 

 in succession. He gave a jerk at 2 and dropped it. 



Second trial, August 15. No. 13 was active as on the previous day, but 

 spent more time in looking and less in running about. He first ran up and 

 down the wire several times ; then he went to L and looked in. His later 

 movements were as follows: up the wire; to the floor; to the door and bit 

 at the edges ; to L and looked ; up the wire to the brace and back to the 

 floor ; to the corner post at 57c and bit the post ; up the wire and bit at it ; 

 down to the floor and again up the wire on the front of the cage; perched at 

 X for some time and then went to the floor and bit Ik; carried Ik up to X 

 and worked with it; bit the Ivnob and the end of the string; pulled 7/c up to 

 X and chewed it; then went to the floor and walked about; carried Ik up 

 the side of the cage; after some time returned to the floor, bit at 57c; carried 

 2k up the wire to X and farther up the wire. 



