Key points are not available for this paper at this time.
Department of Psychology, University of Minnesota Minneapolis, Minnesota *Submitted on February 10, 1956, for publication in the April, 1956, issue of the American Journal of Optometry and Archives of American Academy of Optometry. This research was supported by a grant-in-aid from the Graduate School, University of Minnesota. †Psychologist. Ph.D. Professor of Psvchology.
Miles A. Tinker (Sun,) studied this question.