Letter from JN Pring, The University, Manchester, to The Assistant Secretary, The Royal Society, Burlington House, W Informs he has prepared a more detailed article for "Science Progress" in connection with his work on the "Occurence of Ozone in the Upper Atmosphere", on which subject a paper was read before the Royal Society, and as part of preparing its publication, he requires copies of the experimental results and two diagrams. 30 April 1914