1. Garn, S. M., and Lewis, A. B., Angle Ortho., 32, 14 (1962).
2. Garn, S. M., Lewis, A. B., and Vicinus, J. H., J. Dent. Res., 41, 717 (1962).
3. Garn, S. M., Lewis, A. B., and Bonné, B., Nature, 192, 989 (1961).
4. Garn, S. M., Lewis, A. B., and Vicinus, J. H., in Genetics of Oral Structures, J. Dent. Res., Suppl. 42, No. 6, 1963 (in the press).
5. Van Valen, L., Evolution, 16, 125 (1962).