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THE presence of zinc in living organisms and its essentiality as a nutrient for plants and animals have been recognized for many, ears.1 , 2 Normal persons take in about 10 to 15 mg. of zinc a day, most of it being excreted in the feces, which contain about 10 mg. a day; about 300 or 400 microgm. a day is excreted in the urine.3 Most human organs contain zinc, the amounts in different organs varying between 10 and 200 microgm. per gram of wet tissue.4 The serum zinc concentration has been reported to be decreased in several diseases, notably pernicious anemia. . . .
Vallée et al. (Thu,) studied this question.
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