Prefatory Note 



This monograph represents the outcome of cooperative re- 

 search, and acknowledgments are due to num^erous persons: 

 to Professor E. L. Thorndike thru whose courtesy the tests were 

 printed at Indiana University; to the numerous teachers, princi- 

 pals, and superintendents who gave the tests in their several 

 classes and schools, and did the initial work in scoring results; 

 to the President and Trustees of Indiana University who bore the 

 expense of rechecking, tabulation, and publication, to Miss 

 Cecile White, fellow in philosophy, and Mrs. Gertrude Bell, in- 

 structor in Education, who managed the work of rescoring and did 

 much of the actual work; to Mr. J. J. Liebenburg and Mr. Gleason 

 Pease who made the drawings for the cuts; and to Miss Ivy Cham- 

 ness, assistant editor of University publications, who edited the 

 manuscript for publication. To all of these the writer expresses 

 his sincere thanks, not alone for the actual service rendered, but 

 much more for the very definite sense of professional comradeship 

 which has grown out of these cooperative labors. 



