Acknowledgment

The Federal Board for Vocational Education is indebted to Teachers’ College, Columbia University, for contributing material that served as a basis for this monograph, which has been prepared by Dr. H. L. Smith, Superintendent for Co-operation for the Federal Board, under direction of Charles H. Winslow, Chief of the Division of Research. Acknowledgment is due to Dr. John Cummings, of the Research Division, for editorial assistance.