Letter from David Keilin, on a paper 'Sensitivity to light and the reactions to changes of light intensity of the Echinoid Diadema Antillarum Philippi' by Norman Millott, to D C Martin, assistant secretary of the Royal Society Paper reference code: B.43 The subject of Millott's paper is outside of Keilin's area of expertise, so he cannot easily comment on it. Suggests Professor J E Smith, in the department of Zoology at Queen Mary College in London, would be a suitable referee. [Published in Philosophical Transactions B, 1954]. Received 17 December 1953 16 December 1953