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Iowa Child Welfare Research Station, State University of Iowa, Iowa City
Twelve manganese balance studies with seven children have been made at three different levels of ingestion. Within the limits of the study the amount retained was found to be proportional to the amount ingested, thus indicating that manganese is essential to the physiological development of children. It is suggested that the diet for children should contain between 0.20 and 0.30 mg. of manganese per kilogram.