Madam, - Conan Kennedy's article "Biochemistry, De Selby and Flann O'Brien" (Gallery, November 24th) should have been entitled "Mathematical Physics, De Selby and Flann O'Brien". Unfortunately, the author confused Edward J Conway FRS, the biochemist, with Arthur W Conway FRS, the mathematician. It was the daughter (Teresa Mary) of the latter who married Joseph Conan and is the link between science and Flann O'Brien. - Yours, etc,