1. J. M. Sasse, M. N. Galbraith, D. H. S. Horn and D. Adamson, Proceedings of the 7th International Conference on Plant Growth Regulators, Canberra, Australia, 1970. Springer Verlag, Berlin, in press.
2. D. Adamson and R. Hinde,ibid., in press.
3. M. N. Galbraith and D. H. S. Horn, unpublished work.