Letter from Joseph Proudman, on a paper 'The generation and propagation of ocean waves and swell. I. Wave periods and velocities' by N F Barber and F Ursell In view of the author's remarks, he withdraws his suggestion that the spectra should be replaced with tables. [Published in Philosophical Transactions A, 1948]. Endorsed on recto as received 6 July 1947. 5 July 1947