Experimental Study of Associative Processes 31 



tion will also be called to the force required. In general, 

 however, that was very slight (20 to 100 grams if applied 

 directly). The various boxes will be designated by capital 

 letters. 



A. A string attached to the bolt which held the door ran 

 up over a pulley on the front edge of the box, and was tied 

 to a wire loop (2^ inches in diameter) hanging 6 inches 

 above the floor in front center of box. Clawing or biting it, 

 or rubbing against it even, if in a certain way, opened the 

 door. We may call this box A 1 O at front.' 



B. A string attached to the bolt ran up over a pulley on 

 the front edge of the door, then across the box to another 

 pulley screwed into the inside of the back of the box ij 

 inches below the top, and passing over it ended in a wire loop 

 (3 inches in diameter) 6 inches above the floor in back center 

 of box. Force applied to the loop or to the string as it ran 

 across the top of the box between two bars would open the 

 door. We may call B 'O at back.'' 



Bi. In Bi the string ran outside the box, coming down 

 through a hole at the back, and was therefore inaccessible 

 and invisible from within. Only by pulling the loop could 

 the door be opened. Bi may be called 'O at back 2d.' 



C. A door of the usual position and size (as in Fig. i) was 

 kept closed by a wooden button 3} inches long, J inch 

 wide, \ inch thick. This turned on a nail driven into the 

 box J inch above the middle of the top edge of the door. 

 The door would fall inward as soon as the button was turned 

 from its vertical to a horizontal position. A pull of 125 

 grams would do this if applied sideways at the lowest point 

 of the button i\ inches below its pivot. The cats usually 

 clawed the button round by downward pressure on its top 

 edge, which was ij inches above the nail. Then, of course, 

 more force was necessary. C may be called 'Button.' 



