Letter from John David Griffith Davies, to John Turton Randall, regarding a paper 'The phosphorescence of various solids' by John Turton Randall and Maurice Hugh Frederick Wilkins Sectional Committee: Physics The work has been refused publication as potentially containing information of value to the enemy. A limited number of copies will be printed for Government use, and one copy for the author on condition that it is treated as a confidential document. [Published in the 'Proceedings of the Royal Society of London'] No received date. 9 April 1940