Note 53 — THE MIND OF WOMAN AND THE LOWER RACES
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Of the 3,956 individuals examined, 1,645 were males, and of these 47 (2.857 per cent.) presented supernumerary nipples. Of the 3,956 individuals 2,311 were females, and of these 14 (0.605 per cent.) presented supernumerary mammae or nipples. That is, this anomaly was found to occur more than four times as frequently in men as in women.—J. Mitchell Bruce, "On Supernumerary Nipples and Mammae," Journal of Anatomy and Physiology, Vol. XIII, p. 432.
Leichtenstern, however, whose investigations were of earlier date than those of Bruce, says that supernumerary mammae occur with about equal frequency in the two sexes.—Leichtenstern, "Ueber das Vorkommen und die Bedeutung supernumerärer Brüste und Brustwarzen," Virchow's Archiv für pathologische Anatomie, Vol. LXXIII, p. 238.