Key points are not available for this paper at this time.
The papers which constitute this volume have all been printed in my journals, most of them in the Pedagogical seminary, but are here revised, condensed, or amplified, and provided with up-to-date bibliographies on each topic by Dr. Theodate L. Smith.--Pref., signed: G. Stanley Hall.
Norsworthy et al. (Thu,) studied this question.