Letter from Marcus Laurence Elwin Oliphant, on two papers 'Phosphorescence and electron traps - I. The study of trap distributions' and Phosphorescence and electron traps II. The interpretation of long-period phosphorescence' by John Turton Randall and Maurice Hugh Frederick Wilkins He believes the papers contain no information that would be of use to the enemy. However, it should be checked if the Department of Home Security has no objection to it's publication. [Both papers published in Proceedings of the Royal Society A, 1945]. Endorsed on recto as received 13 November 1940. 12 November 1940