Seven programmes on the beginnings of human life and the early acquisition of immunity to disease.

Today detailed research is focused on the placenta, the narrow barrier of tissue through which all substances must pass from the mother to the developing foetus.
In the programme are: Professor J. D. Boyd, Professor F. W. Brambell F.R.S.,
Professor A. Jost, Professor P. B. Medawar C.B.E., F.R.S., Professor D. R. Newth.
First shown in the 'Life Before Birth' series in July 1960