1. Carpenter, C. R., J. Comp. Psychol., 33, 113 (1942).
2. Freedman, L. Z., and Rosvold, H. E., J. Nerv. Ment. Dis., 134, 18 (1962).
3. Herbert, J., in Progress in Primatology (edit. by Starck, D., et al.), 232 (Gustav Fischer, Stuttgart, 1967).
4. Herbert, J., and Michael, R. P., Acta Endocr. (Kbh), Supp. 100, 173 (1965).
5. Zuckerman, S., The Social Life of Monkeys and Apes (Kegan Paul, London, 1932).