Presented to the Tenth International Congress of Radiology, Montreal, Canada, August, 1962, and the Annual Meeting of the American Speech and Hearing Association, New York City, New York, November, 1962.

* This work was supported by Grants-in-Aid Nos. GM-06665-04 and DE-01650-02 of the National Institutes of Health, Bethesda, Maryland.

From the School of Dentistry, the Division of Speech Pathology, and the Department of Radiology of the University of California, Los Angeles, and the St. John's Hospital Research Foundation, Santa Monica, California.