24 



HAROLD C. BINGHAM 



except where stated otherwise, and is painted within and with- 

 out a dead black. It consists of four maih parts: (1) A is an 

 entrance chamber/ 20 by 15| by 22. The floor of A is provided 

 with a metal tray containing a layer of wet felt. The entrance 



Fig. 3 

 Isometric view of light vision apparatus. Reprinted from Journal Animal 

 Behavior, vol. 3, p. 67. 



box may be removed by raising out of the iron straps, C and C, 

 the board to which it is attached. (2) 5 is a discrimination 



^ Unless otherwise stated, dimensions are given in centimeters and the order of 

 presentation is length, width, and depth — inside measurements. 



