Referee's report by Leonard Bairstow, on a paper 'On transition from laminar to turbulent flow in the boundary layer' by Arthur Fage and J H Preston Sectional committee: Engineering Recommended for publication in Proceedings. It 'fits in with previous publication's of the Royal Society. 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 Proceedings of the Royal Society A, 1941]. Endorsed on verso as received 1940. 1940