"You tell me, that by advice of an eminent physiologist in Louisville, you took tincture of iron. For what? To restore your lost energy. And how? Why, in healthy subjects iron is naturally found in the blood, and iron in the bar is strong; ergo, iron is the source of animal invigoration. But you being deficient in vigor, it follows that the cause is deficiency of iron. Iron, then, must be put into you; and so your tincture. Now as to the theory here, I am mute. But in modesty assuming its truth, and then, as a plain man viewing that theory in practice, I would respectfully question your eminent physiologist: 'Sir,' I would say, 'though by natural processes, lifeless natures taken as nutriment become vitalized, yet is a lifeless nature, under any circumstances, capable of a living transmission, with all its qualities as a lifeless nature unchanged? If, sir, nothing can be incorporated with the living body but by assimilation, and if that implies the conversion of one thing to a different thing (as, in a lamp, oil is assimilated into flame), is it, in this view, likely, that by banqueting on fat, Calvin Edson will fatten? That is, will what is fat on the board prove fat on the bones? If it will, then, sir, what is iron in the vial will prove iron in the vein.' Seems that conclusion too confident?" But the sick man again turned his dumb-show look, as much as to say, "Pray leave me. Why, with painful words, hint the vanity of that which the pains of this body have too painfully proved?" But the other, as if unobservant of that querulous look, went on: