Abstract
The Cu content was determined in plants, foodstuffs, insects, marine animals and land animals. The last were studied at three stages: fetal, newly born, and adult. The Cu content of the livers and skin of rats was increased by adding Cu to the diet. Cu catalyzed the oxidation of "dopa" to melanin. The stimulating effect of Cu on the formation of hemoglobin was confirmed. High amounts of Cu in the diet were not detrimental to growth or reproduction of rats.

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