Note — The Survey Research Centre of the University of Michigan is one of the leading American centres for the scientific study, by the survey or sample interview method, of political, economic and administrative behaviour — indeed of social behaviour generally. Less publicised than the ‘Gallup’ and ‘Fortune’ polls, the scholarly work of such academic centres repays study. These notes kindly supplied by Mr. Miller are published to indicate some of the methodological problems tackled in empirical political studies of this kind.— Ed.