"^ 



444 Jonrnnl of Comparative Neurology ajid Psychology. 



Fig. 2. New cage (see text, p. 351). «, b, c, d, front frame; e, /, gr, h, 

 back frame ; i, ;, Ic, I and m, n, o, p, end frames ; q, brace across front of 

 cage; x, bolts holding frames together; A, B, C, D, boards coverhig back 

 of cage; E, F, G, boards covering end of cage; F and G, door; //, /, J, 

 boards covering top of cage ; Z, floor ; S, slide door in large door ; Ji', door 

 hinges; lo, wing nuts; X, end of brace where animals frequently perched. 

 (Drawn by B. Spencer Greenfield.) 



