THE METHOD OF AGE GRADATION 99 



be found certain tests of so decided a symptomatic 

 value that they will deserve to be adapted for intro- 

 duction into the graded system. In this connection 

 we may allude among others to the modifications of 

 the Masselon test recently proposed by Meumann 

 (v. p. 16) a test that Meumann believes is usually 

 solved with logical insight by the intelligent but not 

 so by the unintelligent. 



Investigations in correlational psychology of 

 which we shall speak in the next section likewise 

 afford many tests whose results exhibit decided cor- 

 respondence with estimated intelligence. These 

 tests are evidently not such as can be introduced 

 directly into the system of graded tests because they 

 deal with fine gradation, whereas the Binet scale 

 recognizes only tests that present merely the al- 

 ternatives " right " or " wrong. " Possibly, how- 

 ever, they will admit of rearrangement into a sim- 

 pler form appropriate to the scale. 



By using all the methodological resources that we 

 have cited we shall gradually succeed in selecting 

 tests that are far more characteristic of the intelli- 

 gence of a given age-level than those now in use and 

 that are homogeneous for the different cultural 

 groups and nations to be tested. 



(b) The composition of series for the several 

 years. Since intelligence is a formal capacity that 

 can be determined only by multiform testing, care 

 must be taken that each single age-level should have 

 a manifold of tests. It is not enough, therefore, to 

 put together any sort of separate tests that happen 

 to be passed by 75 per cent, of those of the age-level 

 in question. If the tests are too similar to one an- 



