Letter from Herbert Frohlich, on a paper 'The foundation of the diffusion theory of rectification' by P T Landsberg, to D C Martin, assistant secretary of the Royal Society Paper reference code: A295 Frohlich writes: 'Dear Dr. Martin, I enclose the paper by Landsberg. It has been significantly altered so that I can recommend its publication in the Proceedings. Yours sincerely, H Frohlich'. Written at The University of Liverpool, 6 Abercromby Square, Liverpool, 7 [England]. [Published in Proceedings A, 1952]. Endorsed on recto as received 22 February 1952. 21 February 1952