26 



WALTER S. HUNTER 



Box D, also used for rats, is similar to Box C in all save two 

 respects: (i) It was not wired for punishment. (2) The doors 

 leading from the light boxes could be closed with wooden slides. 

 The use of these slides was discontinued shortly after the ex- 

 periments began. Pieces of wire mesh were then used. These 

 admitted the light and thus offered less opportunity for the 

 animals to tell which box was open and which was closed. 



The apparatus (Fig. 4) which was used with children was 

 constructed on the same principle as that described above for 

 the other problem boxes. Three boards, each one foot square. 



TT 



Figure 4. (Iround plan of aj)]):u'atiis used with chikiren. 1), dtx)!-; W, window 



were placed against the wall of a room 12' x 14'. The middle 

 square was seven feet distant from the release l)Ox, R. On 

 each of these l)oards was mounted: (i) A 4 c.p. miniature 

 electric light, L; and (2) just below the light, a push button. 

 All three boards were ]xiinted black and were exact duplicates 

 the one of the other. The front, A, of the release box was a 

 lever which could be raised by a handle at P. The experimenter 

 usually sat at E. T is a table which held: (i ) The candy used 

 as a reward in the tests; (2) the switches regulating the lights 

 and the buzzer; and (,V) the buzzer. C is a curtain which hid 

 the experimenter from the subject's view when the latter had 



