This investigation was supported in part by research grants M-1158 and D-853 from the National Institutes of Health, Public Health Service. Portions of this paper were presented at the 1960 convention of the American Association for Cleft Palate Rehabilitation, Denver, and at the 1960 convention of the American Speech and Hearing Association, Los Angeles.

D. C. Spriestersbach (Ph.D., University of Iowa, 1948) is Professor of Speech Pathology, and Kenneth L. Moll (Ph.D., University of Iowa, 1960) is Research Assistant Professor, Department of Speech Pathology and Audiology, and Department of Otolaryngology and Maxillofacial Surgery, University of Iowa.

Hughlett L. Morris (Ph.D., University of Iowa, 1960) is Research Assistant Professor, Department of Otolaryngology and Maxillofacial Surgery, University of Iowa.