Referee's report by William Hume-Rothery, on a paper 'Precipitation in single crystals of silver-rich and copper-rich alloys of the silver-copper system' by Frederic Wood Jones, C M Leech and Charles Sykes Sectional Committee: Physics Recommended for publication in the 'Proceedings of the Royal Society of London', in part. The first half, dealing with the investigation, should be printed. The second half dealing with the discussion, is not of high-enough standard for publication by the Royal Society, containing as it does many assumptions and no definite quantitative theory. Contains extra question - 'Is there any information contained in the paper which likely to be of value to the enemy?' Referee replies no. [Published in the 'Proceedings of the Royal Society of London'] No received date. 21 January 1942