G. STANLEY HALL, EDMUND C. SANFORD, Clark University; H. P. Weld, Vol. XXXIII MORRILL HALL, CORNELL UNIVERSITY ITHACA, N. Y. 1922 TABLE OF CONTENTS An Experimental Study of Children as Observers . T. D. CUTSFORTH and R. H. WHEELER 161 361 Comparative Cognitive Reaction-time with Lights of Differ- |