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The true and original "bezoar-stone" of the East is a concretion found in the intestine of the Persian wild goat. Those which I have seen are usually of the size and shape of a pigeon's egg and of a fine mahogany colour, with a smooth, polished surface.

They are more numerous than those cited by Pliny; they exist in every race and every civilization and refer to a large variety of animals. Probably many of these beliefs date from prehistoric times. In the East the most celebrated of these stones, since the period of Arabic civilisation, is called a bezoar-stone, "Bezoar" is the Persian word for "antidote," and does not apply only to a stone.

Sixteenth century writers, ever ready to invent a history when their knowledge was defective, declared the bezoar-stone to be formed by the inspissated tears of the deer or of the gazelle the "gum" which Hamlet remarked in aged examples of the human species.

The Persian goat's bezoar-stone is found, on chemical analysis, to consist of "ellagic acid," an acid allied to gallic acid, the vegetable astringent product which occurs in oak-galls used until lately in the manufacture of ink. The bezoar-stone is probably a concretion formed in the intestine from some of the undigested portions of the goat's food.