*Presented before the 28th annual meeting of the Eastern Association of Graduates of the Angle School of Orthodontia, at Cleveland, March 15, 1937.

†The key ridge is the prominence below the malar process which divides the canine from the infra-temporal fossa on the lateral surface of the maxillary bone.

*Presented before the 28th annual meeting of the Eastern Association of Graduates of the Angle School of Orthodontia, at Cleveland, March 16, 1937.

**Director of Research of the Bolton Study of Development of the Face of the Growing Child, Anatomical Laboratory, School of Medicine, Western Reserve University.