If then the Centaurs were a tribe of reputed sorcerers and also obtained the secondary name of ‘Beasts,’ the analogy of worldwide superstitions suggests that the link between these two facts is to be found in their magical power of assuming the shape of beasts.
What particular beast-shape the Centaurs most often affected need not much concern us. The analogy, on which my interpretation of the name Pheres rests, makes certainly for some shape more terrifying than that of a horse; and the word φῆρες itself also denotes wild and savage beasts rather than domestic animals. But the horse-centaur, though it monopolised art, was not the only form of centaur known, nor, if we may judge from modern descriptions of the Callicantzari, had it so firm a hold on the popular imagination as some other types. Possibly its very existence is due only to the aesthetic taste of a horse-loving people. Pindar certainly knew of one Centaurus earlier in date and far more monstrous than the horse-centaurs which artists chose to depict, and provided a genealogy accordingly. Moreover in the passage of Hesiod which I have quoted above and which, by its agreement with the _Iliad_ as to the human character of the Centaurs, is proved to embody an early tradition, there is at least a suggestion of a more savage form assumed by the Centaurs. Several of their names in that passage[655] seem to indicate various qualities and habits which they possessed. One is called Petraeos, because the Centaurs lived in rocky caves or because they hurled rocks at their foes; another is Oureios, because they were a mountain-tribe; then there are the two sons of Peukeus, so named because the Centaurs’ weapons were pine-branches. And why is another named Arctos? Is it not because the Centaurs assumed by sorcery the form of bears? There is some probability then that the equine type of Centaur, the conventional Centaur of Greek Art, was a comparatively late development, and that the remote age which gave to the Centaurs the name of Pheres believed rather that that tribe of sorcerers were wont to transform themselves into the more monstrous and terrible shapes of bears and other wild beasts.
But if the particular animal which Greek artists selected as a component part of their Centaurs is thus of minor importance, the fact that their Centaurs were always composite in conception, always compounded of the human and the animal, is highly significant. In discussing the various types of Callicantzari in various parts of Greece, we found that, where there exists a belief in their power of metamorphosis, they are stated to appear in single and complete shapes, while, where the belief in their transformation is unknown, they are represented in composite shapes; and having previously concluded that the belief in their metamorphosis was a genuine and original factor in the superstition, we were led to formulate the principle, that a being of some single, normal, and known shape who has originally been believed capable of transforming himself into one or more other single, normal, and known shapes, comes to be represented, when the belief in his power of transformation dies out, as a being of composite, abnormal, and fantastic shape, combining incongruous features of the several single, normal, and known shapes. Now the horse-centaur of Greek Art is a being of composite, abnormal, and fantastic shape, combining incongruous features of man and animal. If then the principle based on facts of modern Greek folk-lore may be applied to the facts of ancient Greek folk-lore, the horse-centaur of Greek Art replaced a completely human Centaur capable of transforming himself into completely animal form.