HABIT FORMATION IN ALBINO RATS 



25 



IV. EXPERIMENT 2: THE PRELIMINARY INCLINED PLANE 



The apparatus used in this experiment (see Plate VI) was 



designed especially to make a problem exceptionally difficult to 



learn, and in this purpose it exceeded expectations. The basic 



principle is the same as that of the apparatus designed and used 



Vldt^ Yl. The laclmed Vlane. 



by Watson in his experiments at the University of Chicago, 

 called by him the " Inclined Plane," and which is described and 

 illustrated in his monograph "Animal Education," page 37.^ 

 But my apparatus differs from his in several respects. 



Plate VI shows in detail the construction and method of 

 operation. The food box, A, is framed of wood, eleven by 



* Watson: Animal Education, Chicago, 1903. 



