Copy letter from Robert William Frederick Harrison, to Professor Michelson, Foreign Member of the Royal Society Harrison informs Michelson that the enclosed has just been received by the Royal Society, forwarded by the Royal Geographical Society, to whom it was accidently delivered in an 'inexcusable blunder' by the Telegraph Company. He understands that Michelson is to give some experimental illustrations at the opening of the meeting next Thursday, and he asks if he can inform them as soon as possible of any arrangements he wishes to make for the purposes of his experiments. He suggests that if Michaelson has time, he visit Harrison the following morning to settle the matter. 3 December 1907