| Figs. | 1-3. | Kant’s Skull. | Figs. | 5-6. | Fusinieri’s Skull. |
| “ | 4. | Volta’s Skull. | “ | 7-8. | Foscolo’s Skull. |
extreme prognathism of Foscolo (68°) and his low cephalic-spinal and cephalic-orbital index;[20] the ultra-dolichocephaly of Fusinieri (index 74), contrasting with the ultra-brachycephaly which is characteristic of the Venetians (82 to 84); the Neanderthaloid skull of Robert Bruce;[21] of Kay Lye,[22] of San Marsay (index 69), and the ultra-dolichocephaly of O’Connell (index 73), which contrasts with the mesocephaly of the Irish; the median occipital fossa of Scarpa;[23] the transverse occipital suture of Kant, his ultra-brachycephaly (88·5), platycephaly (index of height 71·1), the disproportion between the superior portion of his occipital bone, more developed by half, and the inferior or cerebellar portion. It is the same with the smallness of the frontal arch compared to the parietal.
In Volta’s skull[24] I have noted several characters which anthropologists consider to belong to the lower races, such as prominence of the styloid apophyses, simplicity of the coronal suture, traces of the median frontal suture, obtuse facial angle (73°), but especially the remarkable cranial sclerosis, which at places attains a thickness of 16 millemetres; hence the great weight of the skull (753 grammes).
The researches of other investigators have shown that Manzoni, Petrarch, and Fusinieri had receding foreheads; in Byron, Massacra (at the age of 32), Humboldt, Meckel,[25] Foscolo, Ximenes, and Donizetti there was solidification of the sutures; submicrocephaly in Rasori, Descartes, Foscolo, Tissot, Guido Reni, Hoffmann, and Schumann; sclerosis in Donizetti and Tiedemann who, moreover, presented a bony crest between the sphenoid and the basilar apophysis; hydrocephalus in Milton, Linnæus, Cuvier, Gibbon, &c.
The capacity of the skull in men of genius, as is natural, is above the average, by which it approaches what is found in insanity. (De Quatrefages noted that the greatest degree of macrocephaly was found in a lunatic, the next in a man of genius.) There are numerous exceptions in which it descends below the ordinary average.
It is certain that in Italy, Volta (1,860 c.cm.), Petrarch (1,602 c.cm.), Bordoni (1,681 c.cm.), Brunacci (1,701 c.cm.), St. Ambrose (1,792 c.cm.), and Fusinieri (1,604 c.cm.), all presented great cranial capacity. The same character is found to a still greater degree in Kant (1,740 c.cm.), Thackeray (1,660 c.cm.), Cuvier (1,830 c.cm.), and Tourgueneff (2,012 c.cm.).
Le Bon studied twenty-six skulls of French men of genius, among whom were Boileau, Descartes, and Jourdan.[26] He found that the most celebrated had an average capacity of 1,732 cubic centimetres; while the ancient Parisians offered only 1,559 c.cm. Among the Parisians of to-day scarcely 12 per cent. exceed 1,700 c.cm., a figure surpassed by 73 per cent. of the celebrated men.
But sub-microcephalic skulls may also be found in men of genius. Wagner and Bischoff,[27] examining twelve brains of celebrated Germans, found the capacity very great in eight, very small in four. The latter was the case with Liebig, Döllinger, Hausmann, in whose favour advanced age may be advanced as an excuse; but this reason does not exist for Guido Reni, Gambetta, Harless, Foscolo (1426), Dante (1493), Hermann (1358), Lasker (1300). Shelley’s head was remarkably small.
In the face of all these facts I shall not be taxed with temerity if I conclude that, as genius is often expiated by inferiority in some psychic functions, it is often associated with anomalies in that organ which is the source of its glory.