A system of phrenology
A System of Phrenology is an 1839 Boston work by the Scottish writer George Combe, a systematic treatise on the pseudoscience of reading character from skull shape, aimed at general readers and students. Its pictures are small engraved outlines of heads in profile and front view, drawn over square grids with zigzag and wavy lines marking the supposed brain regions, a plain diagrammatic style a designer could borrow for scientific charts or retro schematic layouts.
