Abstract
Attention has been focused on the ecological aspects of mental illness since Faris and Dunham (1939) showed a higher incidence of schizophrenia in the centre of Chicago than in its peripheral parts. Earlier, Ødegaard (1932) had described a disproportionately high rate of psychotic breakdowns in Norwegian immigrants to Minnesota and in those who had returned to their homeland after a period of time in the U.S.A.

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