Copy letter from Lord Rayleigh [John William Strutt], to Monsieur Pierre Jules Cesar Janssen, Foreign Member of the Royal Society, Observatoire de Meudon, Seine et Cise, France 'Dear Sir, I have to thank you on behalf of the Royal Society for the bronze medal, a copy of one struck in honour of yourself and Professor Lockyer, which you have been good enough to present to the Society, and which will be carefully preserved in our collection. I am, Dear Sir, yours faithfully, Rayleigh Sec. R.S. [Secretary, Royal Society]'. [24 April 1894]