Figure 1
Petrie (1902), ‘Diagram of Climate and Intelligence of Races, each race marked by skull triangles (male only) in race triangle oval of nasal and alveolar indices.’
Figure 2
Petrie (1902), ‘Triangle of three dimensions of skulls comprising three indices, three section areas and capacity, oval showing nasal index (width) and alveolar index (height).’
Figure 3
Fawcett with Lee (1902), ‘Plate V. Male Naqada Crania.’