Referee's report by Sydney Chapman, on a paper 'Atmospheric diffusion shown on a distance-neighbour graph' by Lewis Fry Richardson Sectional committee: Physics Recommended for publication in Proceedings, as the author's previous works on this subject have been published there. The paper should be cut down by three or four pages in length, to ensure it meets Proceedings standards. [Published in Proceedings of the Royal Society A, 1926]. Endorsed on verso as received 19 November 1925. November 1925