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It is a pleasure to acknowledge indebtedness to the various persons who have rendered assistance in the course of the following experiments. Prof. Joseph Jastrow has given wise council and judicious criticism. Prof. Daniel Starch, Prof. V. A. C. Henmon and Prof. F. C. Sharp have aided much by taking a friendly interest in the work and making valuable suggestions. The writer is indebted to Prof. John F. Shepard of the University of Michigan for suggesting the general problem from which the present study has grown. It was through the active cooperation of Dr. William Lorenz, director of the Wisconsin Psychiatric Institute and Dr. Frank I. Drake, superintendent of the Wisconsin State Hospital for the Insane at Mendota, Wisconsin, that the writer was able to secure the results contained in Chapter VIII. Bertha Iutzi Hull has been of very great assistance especially in the difficult earlier stages of the experiment and the pre-paration of the manuscript. Space does not permit the mentioning by name of the one hundred and twenty persons who have given generously of their time as subjects. The writer hereby expresses to them his deepest gratitude.

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