1. Bateson, W., “Mendel's Principles of Heredity” (Cambridge University Press, 1909).
2. Darlington, C. D., “The Evolution of Genetic Systems” (Cambridge University Press, 1939).
3. Waddington, C. H., “The Strategy of the Genes” (Allen and Unwin, London, 1957).
4. Waddington, C. H., Evolution, 10, 1 (1957); J. Genet., 55, 241 (1956).
5. Darlington, C. D., “The Control of Evolution in Man” (Woodhull Lecture). Proc. Roy. Inst. Vol. 37; Nature, 182, 14 (1958); see also “The Facts of Life” (Allen and Unwin, London, 1953).