Letter from Thomas Gold to Sir George Porter FRS, Director, The Royal Institution, 21 Albemarle Street, London, W1X 4BS States he would be very happy to speak on 'Earthquakes and the Deep Earth Gas'. Was a little worried that it might be considered too controversial a topic for such a purpose, althought Gold thinks that the central piece of the story is very well documentd, but it a little controversy or novelty is allowed, he thinks it will be a very good topic that interests many people. Demonstration experiments are difficult to deveise, but he is working on this. Encloses synopsis and biographical note as requested. 8 November 1979