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U. S. Plant, Soil, and Nutrition Laboratory, Agricultural Research Administration, U. S. Department of Agriculture, Ithaca, New York
Rabbits fed whole milk and corn grain require less than 0.1 µg of cobalt per animal per day. This finding is discussed in the light of the hypothesis that the need for cobalt is peculiar to ruminant species and may be concerned primarily with biological processes in the rumen.
2 Present address: Department of Botany, University of Chicago, Chicago, Ill.
Manuscript received 26 February 1947.