1. Mitchell, J. W., and Livingston, G. A., Methods of Studying Plant Hormones and Growth-Regulating Substances, Agriculture Handbook No. 336 (US Government Printing Office, Washington, 1968).
2. Mitchell, J. W., Mandava, N., Worley, J. F., and Drowne, M. E., Nature, 223, 1386 (1969).
3. Joustra, M. K., Protides Biol. Fluids, 14, 533 (1967).
4. Determan, H., Gel Chromatography (Springer-Verlag, New York, 1968).
5. Hayashi, F., and Rappaport, L., Plant Physiol., 41, 53 (1966).