In a previous communication (Legon, 1951) it has been suggested that the areas of heaviest total cancer mortality in England and Wales are the areas of soils richest in organic matter, and that these heavy mortalities may be related to the micronutrient deficiencies that sometimes appear in crops grown on peat soils. The purpose of the present paper is to examine this hypothesis in the light of quantitative data on soils and of recently published work on plant copper metabolism.
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C. D. Legon (1952) studied this question.