Outlines of prenology.
An 1836 Edinburgh publication by George Combe, the phrenology primer "Outlines of Phrenology", written for general readers of the period. Its pictures are white-line skull profiles and frontal views over dark gridded squares, numbered by faculty, showing head shapes for comparison. A designer could draw on the stark contrast of pale outlines on black grids and the diagrammatic, measured look of early scientific charts.
