(Details on BBC1 at 4.0 pm)

Or How to Examine Your Inside from the Outside
The Royal Institution Annual Christmas Lectures to Young People by Heinz Wolff of the Medical Research Council 2: Pumps, Pipes and Flows
At one time the heart was thought to be the very seat of life and love; we now know that the heart is simply a pump, or to be more precise a double pump, keeping the vital blood in circulation. How this circulation is regulated is the subject of tonight's lecture and we shall measure how much blood the heart is actually pumping without spilling a single drop.
Television presentation by BRIAN JOHNSON

with Robin Day and Richard Kershaw
The day's News from Peter Woods is followed by an interview with a man or woman behind the headlines.
Associate producer JOHN REYNOLDS Producer CHRISTOPHER CAPRON

Wales at the end of the 19th century. Life is harsh but uncomplicated in the Rhondda. The Morgans are a happy and united family, but as a new century approaches, the younger generation is restless.

by Richard Llewellyn
The BBC2 Serial: dramatised in six parts by Elaine Morgan
Starring Stanley Baker, Sian Phillips

Life is harsh but uncomplicated in the Rhondda Valleys. The Morgans are a happy and united family but as the new century approaches the younger generation is restless.

starring
Richard Thomas as John-Boy Michael Learned as Olivia Walton Ralph Waite as John Walton Will Geer as Grandpa in The Romance

The Trobriand Experiment
In pubic leaf, warpaint and feathers, serried ranks of Trobriand islanders advance across a field with arms outstretched. They are about to play their extraordinary version of the Old English game of cricket-one where the players start by enacting the arrival of a visiting team by air. Sixty years ago, anthropologist
Bronislaw Malinowski predicted that the vigorous and distinctive culture of these ' savages' would die out quickly under Western influences. Instead, they borrowed and adapted our ideas. Then came famine, and this modified Garden of Eden faced its toughest test-the very survival of a society based on the giving and taking of food.
Horizon's camera observes the solution attempted by a young Trobriander who returns to his island with the greatest magic ever known to his people-a university education. If JOHN KASAIP -WALOVA succeeds, could his way offer a model for other peoples? Narrator PAUL VAUGHAN
Film cameraman JOHN ROOPER Editor PETER GOODCHILD
Written and produced by ALEC NISBETT

Weather

Introduced and conducted by Boris Brott
Tonight's theme Night and Day includes an orchestration of Cole Porter 's song with that name and Prélude a la Nuit from ' Rapsodie Espagnole' by Ravel. Gordon Hunt (oboe)
Karen Shelby (mezzo-soprano)
BBC Welsh Symphony Orchestra led by ROBERT ST JOHN WRIGHT
Producer ARNOLD LEWIS
Director VINCENT DOWDALL BBC Cymru/Wales
(Postponed from 10 November)

JOHN GIELGUD reads
Gus: the Theatre Cat by T. s. ELIOT