E. B. Hart, B.S.
JAMA. 1932;98(8):660-661. doi:10.1001/jama.1932.02730340068030.
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To the Editor:  —I was of course interested in the editorial on nutritional anemia in The Journal, January 23. It is but natural that one not close to the details of this field would be left in confusion by the mass of material appearing in print from various sources. The work of Beard and Myers has added to the confusion. But that confusion will disappear in your own mind, I am sure, if you will turn to page 74 of the November, 1931, issue of the Journal of Biological Chemistry, in which their series of articles appear. Under the caption "Milk Used" you will read that the milk that they used was "poured through about five feet of copper pipe into a large nickel cooler" and that this milk contained 0.44 mg. of copper per liter.It is of course obvious that one cannot demonstrate the supplementary relation of copper


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