Abstract
Editor's Note: We believe that visual aids as a postwar development will get added impetus from the educational techniques being developed in the training programs of the armed forces, and we look forward to more visual aids of different types to complement teaching by other methods. It should, therefore, be of interest at this time to bring to the attention of the readers of The Journal the study of Miss Gertrude Sengbush, conducted at the University of California a few years ago. It suggests possibilities that should point to further progress in the use of visual aids.