434 Journal of Comparative Neurology and Psychology. 

 In tabular form this appears as follows : 



CASES OF 

 CASES OF FAILURE TO 

 IMITATION. IMITATE. 



Chute Experiment A and B 5 2 



Rope Experiment 4 



PajDer Experiment 3 



Screen Experiment 3 2 



Plug Experiment 2 



Button Experiment 3 1 



String Experiment 1 



Total 21 5 



(&) With Respect to the Individual Animals. — Of the eleven 

 animals used, all but two exhibited imitative behavior. These two 

 were given the full series of imitation tests and are recorded as 

 absolute failures. Of the nine animals which exhibited imitative 

 behavior, seven were successful in each experiment in which they 

 were used. E'o. 3 succeeded twice and failed twice ; ISTo. 6 suc- 

 ceeded four times and failed once. JSTo. 5 made the best record, 

 solving three of the problems alone or with slight help from the 

 experimenter and learning all the others (four) bv imitation. The 

 record of N^o. 2 is almost the same, but he required more aid from 

 the experimenter in learning one of the tricks. No. 4 learned two 

 tricks alone, failed on two, and learned three by imitation. ISTo. 9, 

 1^0. 10, and No. 11, each had one opportunity to manifest imitative 

 behavior, and no one of tliem failed to do it. No. 13 had two oppor- 

 tunities and imitated in both cases. 



On the basis of their ability to learn by imitation the animals 

 may be arranged in three classes. 



The first includes those animals which did not manifest a failure. 

 Here would come No. 2, No. 4, No. 5, No. 9, No. 10, No. 11 and 

 No. 13. 



In the second group are the animals which succeeded in some 

 tests and failed in others. Here are No. 3 and No. 6. 



