Referee's report by Louis Rosenhead, on a paper 'Hot-wire investigation of the wake behind cylinders at low Reynolds numbers' by L S G Kovásznay Sectional Committee: Physics Recommended for publication in the 'Proceedings of the Royal Society of London'. Both the important points resulting from the investigation should be mentioned in the summary. Reference should be made to the work of Louis Rosenhead and M Schwabe. [Published in the 'Proceedings of the Royal Society of London'] No received date. 31 December 1948