A spectrographic examination of the mineral content of human and other milk

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Abstract
Ca, Mg, Na, P, Ba, Mn, Rb were constantly present in all samples of both human and non-human milk. K, Sr, Li, Zn, and Al were present in almost every specimen. Cu and Fe were found in every spectrum examined, but owing to the difficulty of obtaining apparatus spectroscopically free from these elements, it was not possible to obtain spectrographic proof of their presence in milk. B appeared to be sporadically present in minute traces. Si was proved to be abstracted by milk from glass. Pb appeared to be a normal constituent of milk, occurring in minute and irregular quantity, and the same was possibly true of Mo. Sn was frequently present in prepared commercial milks. No evidence was found of the following elements[long dash]Sb, As, Be, Bi. Cd, Cs, Cr. Co. F, Ga, Ge, Au. In, Ir, La, Hg, Ni, Cb, Os, Pd. Pt, Rh, Ru, Sc, Si, Ag, Ta, Tl, Sn. Ti, W, V, Y, Zr.

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