A system of phrenology
A system of phrenology, written by George Combe and published in Boston in 1834 by Marsh, Capen, and Lyon, is a treatise presenting the theory that skull shape reveals mental faculties, addressed to general readers and students of the subject. Its pictures are four small engraved profile heads drawn over square grids, with the skull outline and the locations of faculties marked by lines and small stars, showing how a designer might use grid-overlay diagrams for schematic or instructional graphics.
