... the skull. The principal projection to be removed is the superciliary ridge corresponding to the brow at the base of the forehead. It is formed by the projection of the external plate of the skull, leaving a separation or cavity between it and the inner plate, which cavity is called the frontal sinus, and is sometimes half an inch wide. As there is no positive method of determining its dimensions in the living head, there must ever be some doubt concerning the development of the perceptive organs which it covers. The superciliary ridge at the external ... — Buchanan's Journal of Man, July 1887 - Volume 1, Number 6 • Various
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