Professor Lord May of Oxford, OM, AC, Kt, FRS, Formerly Chief Scientific Adviser to the Government and President of the Royal Society, will give the Twelfth Roskill Memorial Lecture, entitled Relations among nations on a finite planet, at 5 p.m. on 21 February 2007, at Wolfson Hall, Churchill College. Admittance is by ticket only. Requests for tickets should be made to the Archives Administrator, Churchill Archives Centre, Churchill College (tel. 01223 336166, e-mail julie.sanderson@chu.cam.ac.uk).