Referee's report by Edward Victor Appleton, on a paper 'Short period fluctuations in the characteristics of wireless echoes from the ionosphere' by Thomas Lydwell Eckersley and F T Farmer Sectional committee: Physics Recommended for publication in Proceedings. Contains extra question - 'Is there any information contained in the paper which likely to be of value to the enemy?' The advice of the Air Ministry should be sought , in view of the technique employed in the paper. It should be confidentially referred to the Director of Communications Development at the Ministry of Aircraft Production, who should refer it to the Superintendent at the Air Ministry Research Station. [Published in Proceedings of the Royal Society A, 1945]. Endorsed on verso as received 20 September 1940. September 1940