A Social Medicine based on Social Statistics.

I. Experience in Industrial Fatigue THIRTY years ago I was appointed investigator to a committee set up by the British Association, meeting at Birmingham, to study "Fatigue from the Economic Standpoint". I took 'economic' as a clue pointing me toward the external behaviour of men at work and pointing away from studies of the physiology of fatigue internal to a man. The data at my disposal were thus confined to the external conditions likely to influence a man's work and the external tests of a man's efficiency at work. The findings which I first reported1 about the effect of such conditions as long hours or different types of work upon such tests of efficiency as output and accidents gradually developed into a scheme of study, published in 19242, which I have found a useful framework for co-ordinating the results of subsequent inquiries. The scheme is here presented in bare outline.