Referee's report by Robert John Strutt, 4th Baron Rayleigh, on a paper 'The coagulation of smokes and the theory of Smoluchowski' by G Nonhebel, James Colvin, Hubert Sutton Patterson and Robert Whytlaw-Gray Sectional Committee: Physics Recommended for publication in the 'Proceedings of the Royal Society of London'. Can only judge the paper in a general way owing to a lack of familiarity with the subject. [Published in the 'Proceedings of the Royal Society of London' A, 1927] Endorsed on verso as received 23 July 1927. [July 1927]