Phrenology; how to tell your own and your friend's character from the shape of the head
A 1910 popular manual on phrenology by Charles H. Olin, published in Philadelphia by the Penn Publishing Company, explaining how head shape supposedly reveals character to general readers. The pictures are plain line drawings of heads in profile and one frontal view, with arrows marking the areas of the skull linked to traits, offering a designer a simple diagrammatic vocabulary of profiles and labelled cranial zones.
