Note 887 — BOOK VII.835 MAN, HIS BIRTH, HIS ORGANIZATION, AND THE INVENTION OF THE ARTS.
John Bostock translation
Some of the commentators have supposed, that Pliny, or Phylarchus, from whom he borrows, was misled by the ambiguity of the Greek term ἵππος, which signifies either a horse, or a tremulous motion of the eye. But, even admitting this to be the case, the wonder is scarcely diminished; for we have the double pupil in one eye, while this supposed tremulous motion is confined to the other.—B.