PAPERS OX PSYCHOLOGY AND EDUCATION 367 



as G-l, G-2, G-3, G-4, G-5, G-6, G-7. Of these G-l, G-2, 

 G-3 were tests which, with some changes and additions, 

 now constitute Series I of the Dearborn Group Tests of 

 Intelligence. 1 G-4, G-5, and G-6 included parts of 

 several standard psychological U vera! tests now 



a part of Series II of the Dearborn Group Tests of In- 

 telligence, 1 and certain other psychological tests devel- 

 oped in the Harvard Psychological Laboratory. G-7 

 was one of the Alpha Tests of the Army Psychological 

 Examination. All of these tests were standardized and 

 graduated according to the plan indicated below, where- 

 in are chosen the grades in which each test was given. 



Grade 



Each pupil was given three or more different intelli- 

 gence tests, to avoid, as far as possible, the contingency 

 that a chance failure or success in any one test might 

 misrepresent the pupil's true capacity. Such a contin- 

 gency was further. avoided by the fact that in most cases 

 each test was given on a different day, that the dangers 

 of an "off day" might be lessened. To avoid the diffi- 

 culties usually encountered when pupils of widely differ- 

 ing degrees of maturity and of widely differing degrees 

 of education are tested by the same materials, different 

 tests were given to pupils of different grades, but those 

 tests so overlap that comparison and correlation are pos- 

 sible throughout with known relations between the differ- 

 ent tests. 



As a basis for obtaining some data on the possible 

 correlation between a teacher's judgment of mental abil- 

 ity and the results of these tests, the teachers in grade 

 one were asked to make a list of all their pupils whom 

 they would designate as of average mentality, i. e., fall- 

 ing in the middle fifth of their classes. When these lists 

 were received a comparison was made with the list con- 



1 These tests are now published by the J. B. Llppincott Company, Phila- 

 delphia. 



