1. Glick, Bruce, Ohio J. Sci., 62, 13 (1962).
2. Hutchins, M. O., Newcomer, W. S., and Thayer, R. H., Poultry Sci., 41, 1807 (1962).
3. Snedecor, G. W., Statistical Methods (Iowa State Univ. Press, 1955).
4. Duncan, D. B., Biometrics, 11, 1 (1955).
5. King, J. R., and Farner, D. S., Biology and Comparative Physiology of Birds, edit. by Marshall, A. J., 2 (Academic Press, 1961).