DIVISION D MENTAL SCIENCE 



(Hall 7, September 20, 10 a. m.) 

 SPEAKER: PRESIDENT G. STANLEY HALL, Clark University, Worcester, Mass. 



THE UNITY OF MENTAL SCIENCE 



BY GRANVILLE STANLEY HALL 



[Granville Stanley Hall, President of Clark University, and Professor of Psychology 

 and Education, since 1889. b. February 1, 1846, Ashfield, Mass. A.B. Williams 

 College, 1867; B.D. Union Theological Seminary; Ph.D. Harvard College; 

 LL.D. Williams College, Michigan, and Johns Hopkins University. Instructor 

 and Lecturer, Harvard University, 1874-76; Professor of Psychology and 

 Education, Johns Hopkins University, 1880-89.] 



WE have great reason to congratulate ourselves on the progress 

 of psychology, not only in this country, but in the world, during the 

 last quarter of a century. Not only have students, teachers, text- 

 books, journals, societies, laboratories, and monographs increased, 

 and new fields have opened and old ones widened, but our depart- 

 ment has been enriched by original contributions that have pro- 

 foundly modified our views of mind and even of life itself. For the 

 first time in this field American investigators have borne an import- 

 ant and recognized part in advancing man's knowledge of the soul. 

 Among these we take pride even in the presence of our distinguished 

 foreign guests in naming first of all James, who, more than any other 

 American, has occupied and influenced the psychological thought 

 of both experts and students here for a decade, and whose charming 

 personality and style have done most to infect cultivated laymen 

 in all adjacent fields with interest in psychology and to make Amer- 

 ican thought known and respected abroad; Ladd, to whom we owe 

 the first text on physiological psychology in English, and who, more 

 than any other American, illustrates the old tradition of a system 

 of philosophic thought large enough to embrace most of the topics, 

 from the laboratory to religion; Miinsterberg, who has not only 

 done more than any of his distinguished Teutonic predecessors, from 

 Agassiz and Lieber down, to make Germany and America know and 

 respect each other, but has been the first to lay the foundations of a 

 new efferent system of thought which harmonized the best in Fichte 

 and Schopenhauer with the choicest results of the laboratory; Titch- 

 ener, with his thorough English training, whose ceaseless productiv- 

 ity makes him already in the widening fields he cultivates our Amer- 



