DEVELOPMENT OF MODERN COMPARATIVE PSYCHOLOGY 



PLATE 



Early Apparatus of Kline and Small 



Fig. i. Simple Problem Box (7x7x6 in.). By scratching, biting or gnawing away the strip of paper, A, which released the door and 

 allowed it to be pulled upward by the spring or rubber band, the box could be entered and food obtained. After Kline (154, 155). 



Fig. 1. Sawdust Box (7x7x6 in.). By digging away the sawdust at the proper place, the box could be entered and food obtained. Both 

 this and the box of figure 1 were placed in a large observation cage (16 x 10 x 16 in.) during experimentation. After Kline (154, 155). 



Fig. 3. Hampton Court Maze (6 x8 ft.). The pathways were made of wire mesh (J in.) sides, four inches in width and depth. Entering at 

 £, the animals were required to run through the labyrinth to food placed in the dish, F, in the center. After Small £-09). 



