Letter from Samuel Tolansky to D C Martin, concerning two papers: 'Variations in the texture of diamonds' by F C Champion, and 'Variations in the β-particle counting properties of diamond' by N G Trott Paper reference code: A136 and A137 Tolansky returns two papers, commenting on the similarities and an inconsistency which should be addressed and rectified. Written at Department of Physics, Royal Holloway College, University of London, Englefield Green, Surrey [England]. [Both papers published in Proceedings A, 1953]. Endorsed on recto as received 29 July 1953. 28 July 1953