ELIMINATION OF ERRORS IN THE MAZE 



71 



such progression. Stated in percentages, four per cent were 



progressive, eight per cent possibly progressive and eighty-eight 



per cent non-progressive. 



Here we find only three cases or thirteen per cent where IV 



and V were eliminated before II and III. The averages showed 



no progression; IV and V were not even eliminated before II 



and III. 



TABLE IV 



Group D— 300 Days 



3 cases (**) or 14% uniformly progressive. 



2 cases (*) or 9% doubtful. 



17 cases or 77% not progressive. 



3 cases or 14% where IV and V were eliminated before II and III. 



Group D— 22 Rats 



These rats began the problem when three hundred days old. 

 Three of the twenty showed uniformly progressive elimina- 

 tion, two showed possible progressive elimination, while seven- 



