102 PSYCHOLOGICAL METHODS OP TESTING INTELLIGENCE 



measurement for the mental ages 12 to 15. We must 

 admit that the discovery of appropriate tests for 

 these higher levels of mental maturity is much more 

 difficult than for the younger children, but the diffi- 

 culty is to be overcome. Thus, Terman and Childs 

 (64) have recently proposed a series of tests, each 

 one of which is susceptible to diverse gradings with 

 respect to the capacities that it requires, so that it 

 can be employed up to mental age 15. Among these 

 tests are arithmetical reasoning, familiarity with a 

 list of selected words, a generalization test (discov- 

 ering the 'moral' of a fable that is read to the sub- 

 ject) and the Ebbinghaus completion test with the 

 task made progressively more difficult. 26 



Let us hope that in such a way we may gradually 

 advance from one year to another and may finally 

 create a series for adults as the termination of the 

 whole scale. However, this problem is certainly not 

 so easy of solution as Binet thought when he trans- 

 ferred to higher ages tests that he had originally de- 

 veloped for the years 11, 12 and 13, and made the 

 last of these groups over into tests for "adults" by 

 the addition of two new ones. 



Another thing that is greatly to be desired is an 

 extension of the system by the creation of parallel 

 series of tests for each year. 27 How gladly would 

 we use the method to trace the mental development 

 of the same children through several years; but 

 there are difficulties in the way of this, because, of 

 course, when the same tests are repeated, the child 



^See Appendix II. 

 "Cf. Binet, 36, p. 163. 



