Referee's report by Charles Galton Darwin, on a paper 'Diffraction' by E T Hanson Sectional committee: Mathematics Recommended for publication in Philosophical Transactions, in full. It is a 'sound piece of work which should be placed on permanent record. The symbols used should be updated to more contemporary ones. [Published in Philosophical Transactions A, 1930]. Endorsed on verso as received 3 December 1929. December 1929