METHODS OF EXHIBITING REACTIVE TENDENCIES 



17 



The plan of the medium sized apparatus appears as figure 1, 

 and in figure 2 there is shown an enlargement of one of the 

 reaction boxes, with the arrangement of sliding entrance and exit 

 doors and the concealed reward mechanism. Figure 3 represents 

 the three sizes of apparatus in their relations. These must, of 

 course, be built separately and be independent of one another. 



Figure 2. — Ground plan of reaction box. En, entrance door; Ex, exit door; s, s, 

 wooden guides for sliding door; B, wooden block for food cup; R, food cup. 



The small apparatus should be made of quarter inch white 

 wood (poplar), red wood, or pine, according to locality, and 

 covered with netting made of No. 20 wire, three meshes to the 

 inch. The medium sized apparatus should be made of half inch 

 stock, and the wire netting used as a covering, or for other 

 necessary purposes in connection with it, should be No. 17 wire, 

 two meshes to the inch. The large apparatus should be made 

 of seven-eighths inch stock, and the accompanying wire netting 

 should be made of No. 12 wire, one mesh to the inch. 



