Correspondence regarding the 11th General Assembly of the International Astronomical Union in Berkeley, California, August 1961, including travel arrangements, attendees from the Royal Greenwich Observatory, attendance of Dr Stoy and Dr Evans, and approval from the Admiralty. There are also letters concerning Dr Cousins's visit to the U.K. and U.S.A., and on Dr Wilkins's invitation to the 'Space Age Astronomy' symposium. The correspondents include N.H.A. Warren, Dr Wilkins, Mr Barker and Mr Sadler.