This volume encompasses the Proceedings of the First International Colloquium on Physical and Chemical Information Transfer and Regulation of Reproduction and Ageing (Colloquium '74-PCITRRA), held at the F. Joliot Curie International House of Scientists, Varna, Bulgaria, October 7-14. This international event was made possible by the financial support afforded by the International Union of Biochemistry through Doctor P.N. Campbell, the International Union of Pure and Applied Biophysics through Doctor R.D. Keynes, UNESCO, and the Bulgarian Academy of Sciences. The characteristic and...