Copy letter from Robert William Frederick Harrison, to Lord Rayleigh [John William Strutt], President, Royal Society Harrison forwards a letter and abstract from Thomas Mather for his consideration, and he encloses his reply, which he wrote with an awareness of Dr Joseph Larmor's doubts about the suitability of the paper for the Royal Society. He also submits a letter from Professor Liveing in response to the enquiry he sent, at Rayleigh's instruction, about purchasing radium. Sir William Huggins says he has written directly to Rayleigh. Harrison notes in a postscript that there has been nothing to print for the meeting regarding the President's paper, and that the full paper is at the printers. 24 June 1907