* From the Department of Orthodontics, University of Illinois.

Based on thesis submitted by J. P. Howland in partial fulfillment of the requirements for the M.S. Degree, Graduate College, University of Illinois. This study was supported in part by the United States Army.

Summary of a thesis submitted in partial fulfillment of the requirements for the degree Master of Science in Dentistry (orthodontics), Baylor University College of Dentistry, 1965.

This study was supported in part by U.S.P.H.S. grant no. FR-05343-01 and The Medical Research Foundation of Texas.

Read before the Midwestern Component of the Angle Society, Ft. Lauderdale, Florida, January, 1965.

* Summary of a thesis submitted in partial fulfillment of the requirements for the degree of Master of Science from Northwestern University.

* From the Institute of Child Behavior and Development, University of Iowa, and supported in part by a research grant, D-217, from the National Institute for Dental Research, National Institutes of Health.

* Thesis submitted in partial fulfillment of the requirements for the Master of Dental Science degree, Tufts University, 1964.

* This research was supported in part by the following National Institutes of Health grants; DE-01828-02 and HD-00175-03.