Some scientific concepts in perspective
3: Valency by CHARLES COULSON, F.R.S. Rouse-Ball Professor of Applied Mathematics, University of Oxford
The idea of the 'valency' of atoms underlies the whole of chemistry: in three dimensions; it explains the complexity of molecular structures; it is the theoretical foundation of the plastics industry. But what is the nature of this indispensable property of matter?
Instinct, by Anthony Barnett: October 17
This series of talks is now available as a BBC booklet and can be obtained hy sending a cheque or crossed postal order for 4s. 6d. to [address removed].