Allen, Association in the Guinea Pig. 



311 



hours on a simple problem of ingenuity,' and returned to find 

 it in the same position. Another guinea pig was left all night 

 to solve a problem^ but failed. 



The problems which could be most successfully solved 

 were simple boxes with doors swinging from the top so that 

 they could be easily pushed open ; and various forms of laby- 

 rinth. It will be seen that the prerequisite for solution of such 

 problems is activity and not ingenuity. The mentality required 

 was only recollection of the path leading to the food sufficiently 

 distinct to modify successive reactions. The associations which 

 might be formed were controlled as carefully as could be, and 

 will be mentioned under the various experiments. 



Test II. Recalling a simple path. 



Simple problems of finding the way were given to the 



Text-figure 2. 



• The door of a wire box was to be pulled open by a string running over a 

 pulley and hanging free outside about the level of the guinea pig's nose. 



'^ The problem was to walk up an inclined plane, push open a wooden door 

 hung at the side, pass through a short wooden passage to a wire door also hung 

 at the side, and pushing that open, to walk down another inclined plane to food 

 in the next cage. The food was visible and could be smelt through the wire 

 partition between the two cages. 



[19] 



