This paper was presented in part at the 1958 Convention of the American Association for Cleft Palate Rehabilitation, San Francisco. The investigation was supported by Research Grant D-553 from the National Institute of Dental Research of the National Institute of Health, Public Health Service. Records were obtained at the Cleft Palate Center of the Chicago Professional Colleges, University of Illinois, Chicago.

Joanne D. Subtelny (Ph.D., Northwestern University, 1956) is Research Associate, Orthodontic Department, Eastman Dental Dispensary, Rochester, New York.

Herbert Koepp-Baker (Ph.D., University of Iowa, 1938) is Research Professor in Speech Pathology, Department of Speech Pathology, Correction, and Audiology, and Staff Consultant in Cleft Palate and Cleft Lip, Co-operative Clinical Services Center, Southern Illinois University.

J. Daniel Subtelny (D.D.S., University of Pennsylvania, 1947) is Head, Department of Orthodontia, Eastman Dental Dispensary, and Assistant Professor of Dentistry, School of Medicine and Dentistry, University of Rochester.