Copy letter from Robert William Frederick Harrison to E A Sperry, Hotel Adlon, Unter den Linden 1., am Pariser Platz, Berlin, Germany 'Dear Sir, With reference to your application to exhibit at the Royal Society's Soiree on June 24th next, I regret to say that at this late date it will not be possible to extend the programme further. The Soiree Committee, however, desire to thank you for the offer.' 18 June 1909