Letter from Philip Bowden, on a paper 'Measurement of the adsorption of surface-active agents at a solution-air interface by a radiotracer method' by Ann A Argyle, J K Dixon, D J Salley and A J Weith, to D C Martin, Assistant Secretary of the Royal Society Paper reference code: A21 Recommended for publication in Proceedings now that the paper has been edited. Written at the Department of Physical Chemistry, University of Cambridge [England]. [Published in Proceedings A, 1950]. Endorsed on recto as received 12 April 1950. [April 1950]