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Sir, Tho’ iron is universally allowed to be one of the most powerful medicines now in use, yet many physicians observing, that thefæces of patients, who used it either in a metallic or saline form, were tinged of a black co­lour, have been led to think, that, in a metallic state, it could not be reduced into particles fine enough to be received by the lacteal vessels; and if taken in a saline form, that it underwent a precipitation in the intestines, by which, being reduced to an earth or calx, it was in like manner rendered incapable of making its way into the blood.

philosophical transactions of the royal society of london

LXXIX. Account of an experiment, by which it appears, that salt of steel does not enter the lacteal vessels; with remarks. In a letter to the Rev. Tho. Birch, D. D. Secr. R. S. By Edward Wright, M. D