Philadelphia: University of Pennsylvania, 1941. Offprint. Large octavo (24.75cm.); original grey printed staplebound card wrappers; ,18pp. Near Fine. Reprinted from the Journal of Negro Education, April, 1941. Dissertation presented to the faculty of the graduate school of University of Pennsylvania in partial fulfillment of the requirements for the degree of Doctor of Philosophy. Prominent psychologist's first independently published piece, earning him the first PhD awarded to an African American from the University of Pennsylvania.