Copy letter from Lord Rayleigh [John William Strutt], to Professor Henri Moissan, Foreign Member of the Royal Society, Faculte des Sciences a la Sorbonne, Paris [France] 'Dear Sir, On the occasion of your visit to London, we may, I hope look forward to your presence at the Royal Society. It would, I am sure, be a source of pleasure to the Fellows if you allowed us to announce a communication from you - which may be quite informal - at the meeting on the Thursday at 4.30 p.m. Faithfully yours, Rayleigh President R.S. [Royal Society]'. 2 May 1906