Note 179 — Chapter IX · THE ORDER UNGULATA
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If from any accidental circumstances these teeth are not constantly worn down by friction, they grow into a complete circle, the point penetrating the bone of the jaw close to the root of the tooth. The natives of the Fiji Islands avail themselves of this circumstance to produce one of their most valued ornaments—a circular boar’s tusk: the upper canines being extracted, the lower ones are allowed to grow to the desired form.