In the skulls of various races of mankind—
| Per cent. | |
|---|---|
| Ancient Peruvians | 15 |
| Australian blacks | 28 |
| Skulls provided with “students’ sets” | 4·1 |
| Criminals (3,200), (Lombroso, 16 per cent.) | 20 |
| Negroes | 10 |
| Prehistoric skulls | 14·3 |
(b) Indirect Cerebrogenous Varieties.
1. External angular process of the frontal bone abnormally large. In criminals (704), 11·9 per cent.
2. Excessive size of orbits (exceeding the highest degree of Mantegazza’s scale of the index cranio-orbitalis)—
| Per cent. | |
|---|---|
| Lombroso | 9 |
| Kurella | 8·2 (of 218 cases) |
3. Abnormal width of frontal sinuses—
| Criminals | 13 (of 252 cases) |
| Skulls provided with “students’ sets” | 4 |
4. Strongly developed superciliary ridges—
Lombroso: