6.40 Biology: The Vertebrate Kidney.
7.5 Ecology: Ants and Acacias. 7.30 The Atomic Clock.

How did Wagner use harmonies to achieve his effects in Tristan und Isolde? The opening bars of the Prelude and the closing bars of the Liebestod are played and discussed.
Producer ROBERT PHILIP
A BBC/Open University production

helps you plan your weekend by previewing daytime programmes of special interest from the Open University. This week's selection includes Education in Trinidad and Inner City Story.

in The Chimp
Stan and Ollie move in the best circles until the circus goes broke, but parting gifts of fellow performers keep them well up to scratch.
A HAL ROACII film
Directed by JAMES PARROTT

The Day the Sun Blowed Up Narrated by James Cameron
On 16 July 1945, at 5.30 in the morning, the world's first atom bomb was experimentally exploded in the desert of New Mexico. This is the story of the fateful days of secret preparation for the test. It is told by some of the scientists and soldiers who were intimately concerned, and is illustrated by previously unseen colour film. The story is also told by some of the local inhabitants for whom the birth of the nuclear age came as a total and alarming surprise. ' I heard the explosion and thought something had blowed up in the yard out in front of the store. I went out and there was a man just standing there looking kind of dumbfounded and I asked him, "What blowed up out here?" And he said, " Look over yonder," (looking to the east of us) "the sun blowed up!
Film editor MIKE APPELT Producer STEPHEN PEET

Sally James and actor/singer David Soul with a lively mix of music and conversation with guests from all areas of the entertainment world.
Editor PETER BERCOMBE BBC Birmingham

with subtitles, followed by Weather

visits Northern Ireland with Clay Jones
Twelve years ago Crosbie Cochrane set out to create a garden for all seasons. He aimed for seclusion and an illusion of size, and his design provides both. There are few flowers, the colour comes from the foliage of conifers and deciduous plants.

BBC Birmingham Book, Gardeners' World Cottage Garden, £4.75, BBC videobooks and laservision videodiscs, Mr Smith 's Vegetable Garden (BBCV 1000). Mr Smith's Flower Garden (BBCV 1001), Mr Smith's Indoor Garden (BBCV 1002), from retailers

An eight-part examination of the history and current state of the British economy. Written and presented by John Eatwell 5: A Tendency to Deflate
International performance is reflected by the balance of payments. In the market system there is an inbuilt tendency to deflate; debtor nations get deeper and deeper into debt. Is there a remedy?
Directed by ROBERT ALBURY Produced by TONY ROBERTS

Buxton
This week Paul Gambaccini and Fran Morrison visit the Buxton Festival.
This adventurous festival has taken for its theme this year the 100th anniversary of the birth of the Hungarian composer Zoltan Kodaly. There are songs written by Kodaly, sung by his young widow Sarolta, and, from the famous Opera House, an extract from the British premiere of his opera Hary Janos.
Kodaly and children were synonymous, as is the Buxton Festival and children's opera. This year Charles Strouse , who wrote Annie, has a premiere of his new musical Nightingale. And lending their particular blend of anarchic humour to the programme are this year's Cambridge Footlights.
Outside broadcast lighting GEORGE NORTON
Outside broadcast sound
NORMAN MCLEOD
Producer DIANA LASHMORE
Series producer BOB MARSLAND

by MERVYN HAISMAN music by NEIL INNES starring
Glynis Barber
; as the famous
Daily Mirror strip-cartoon heroine and featuring and with the voice of BOB DANVERS WALKER
Will Jane succumb to enemy pressure? Find out in the final instalment of her wartime adventures.
(A compilation of the Jane serial can be seen next Sunday evening)

Denis Norden is not certain which route to follow when asked, What can you tell me about A = 440? ' in tonight's musical quiz with Ian Wallace , John Amis and Frank Mulr
Questions set by Steve Race
Television presentation douglas hespe

starring Robyn Nevin with the voice of Rosalind Dunbar The colourful, and often sensational story of Helen Porter Mit. chell, an Australian who grew up to be one of the greatest sopranos of all time - Dame Nellie Melba.
This ' vaudeville' biography traces Melba's rise to fame and fortune from her tomboyish girlhood tc the glittering salons of Europe, the scandals of her private life and the many ' final' comebacks of old age.
The diva's own voice is heard in two of the arias, Ah fors' e lui' from La Traviata and Mimi's farewell from La Bohème.
Written by JACK HIBEERD
Directed and produced by ALAN BURKE fOR the AUSTRALIAN BROADCASTING COMMISSION

12.1 Basic Education for Adults. 12.2! Curriculum Design and Development.