The Nuttall Encyclopedia
An angle formed by drawing two lines, one horizontally from the nostril to the ear, and the other perpendicularly from the advancing part of the upper jawbone to the most prominent part of the forehead, an angle by which the degree of intelligence and sagacity in the several members of the animal kingdom is by some measured.
Wood, James, ed. Entry for 'Facial Angle'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/f/facial-angle.html. Frederick Warne & Co Ltd. London. 1900.