Copy letter from Henry Hallett Dale, Secretary of the Royal Society; to Dr. R. H. Todd, Hon. Secretary of the Federal Committee, British Medical Association in Australia, 30-34 Elizabeth Street, Sydney, Australia Informs that an invitation to appoint a delegate for the Lister [Centenary] Celebrations have been sent to the Universities of Adelaide, Sydney and Melbourne as well. States that a programme of the centenary can be sent to the delegates if addresses are given, otherwise they will receive them once they arrive in England. 7 October 1926