Figure 1. Multiple Choice Apparatus for Use with Pigs 



A. The reaction-mechanisms from the experimenter's position, 

 cords for operating doors. Entrance doors 2 to 6 are raised. 



B. The same from the pig's point of view, showing one pig w 

 trial. Entrance doors 2 to 6 raised as in figure A. 



C. The same view as that of figure B except that the pig has 

 the reaction-space and is about to enter the middle box (no. 4) of 

 are open. 



D. Here the pig is shown, after appropriate reaction, feeding 

 box no. 4. The experimenter appears in the position necessary 

 of cords and observation of response. 



E. The reaction-mechanisms seen from one end. 



showing weighted 



aiting in yard for 



been admitted to 

 those whose doors 



in the trough of 

 for manipulation 



