Copy letter from Edward Victor Appleton to A C Egerton, The Royal Society, Burlington House Oliphant's suggestion came from a discussion with Akers, whose Tube Alloys Technical Committee had just debated the control of information likely to be useful to the enemy. Asks Egerton to write to Paneth to say that his lecture 'should carefully refrain from speculating on the possibility of trans-uranium elements and the methods by which they might be produced'. Copy marked 'Secret'. 22 January 1942