THE DELAYED REACTION IN CATS 



89 



were three other pulleys through which passed cords from the 

 three sliding doors marked D in the figure. With the aid of 

 these cords, the experimenter could stand behind the release 

 box and control the door at each of the boxes. The release box 

 was covered with wire of \" mesh, and the board B upon which 

 was fastened the switches for both light and sound. The light 

 stimulus came from 8 c.p. lamps, so wired that any one of them 

 could be cut in at a time. The current was obtained from a 

 110 volt switchboard B. 



B 



h 's i 



Figure 1. — Ground plan of apparatus 



In order that the cat might not come in contact with the 

 lamps, and, also, not be hindered in entering the boxes, a hole 

 was bored in the back wall of each of the boxes and a lamp 

 placed outside and behind each box. The holes were of the same 

 size and 5" from the floor. The lamps were mounted on bases 

 which rested on the floor, and were placed behind the holes so 

 that they had equal intensities and could be observed with equal 

 ease from the release box. One 8 c.p. lamp hung over the 

 center of the apparatus and 4' from the floor throughout the 

 experiment. This light was shaded with a paper bag which 

 made it necessary to keep fresh sawdust on the floor of the box 

 to make the movements of the animals clearly visible. At the 



