Four talks on a current problem in biology
3: Jigsaws and Penny-Whistles by JOHN MAYNARD SMITH Reader in Zoology,
University College, London
Need the shape of an embryo depend on the shape of its constituent parts Dr. Smith suggests not, and describes how a pattern of ' chemical waves * may give rise to the geometrical complexity of an animal. Second broadcast
See also 8.40 p.m.

GUSTAV LEONHARDT (harpsichord)
Suite in E flat major (Bdhm)
Suite in F minor (Handel) on a gramophone record

4: The Molecular Basis by SYDNEY BRENNER of the M.R.C. Unit of Molecular Biology, Cambridge
The development of an embryo is a matter of large-scale organisation, but what is organised is a mass of molecules. Dr. Brenner describes some of the latest ideas of how molecular activity can control the emergence of form and pattern. Second broadcast
The scripts of these talks have been published as an illustrated pamphlet which can be ordered by sending a crossed postal order for 3s. Od. to BBC Publications [address removed]

Sam Wagner in conversation with JONATHAN MILLER recorded in New York
Produced by DOUGLAS CLEVERDON
After an eventful career in the tougher districts of New York, Sam Wagner settled for the job of taxi driver.
To be repeated on October 22

Mass in C major
HONOR SHEPPARD (soprano) JANET BAKER (contralto)
ALEXANDER YOUNG (tenor) ROGER STALMAN (bass)
LEEDS PHILHARMONIC SOCIETY CHORUS
Chorus-Master, Donald Hunt BBC NORTHERN ORCHESTRA Leader, Reginald Stead Conducted by NICHOLAS GOLDSCHMIDT From Leeds Town Hall

Stevie Smith introduces and reads some of her own poems

played by FREDERICK GRINKE

Today's overseas commodity and financial news. London Stock Market closing report