Letter from F W [Frank Watson] Dyson, Royal Observatory, Greenwich, to [Joseph] Larmor They are considering a suitable subject for discussion at the geophysical meeting in May, and have taken this as an opportunity to discuss the need for a Geodetic Institute. Dyson asks if Larmor would like to either open the discussion or to follow [Henry George] Lyons, who has also been asked to speak. 19 March 1919