Thus in each of these great festivals we find that the Olympian gods vanish away, and we are left with three things only: first, with an atmosphere of religious dread; second, with a whole sequence of magical ceremonies which, in two at least of the three cases,[18:2] produce a kind of strange personal emanation of themselves, the Appeasements producing Meilichios, the Charm-bearings Thesmophoros; and thirdly, with a divine or sacred animal. In the Diasia we find the old superhuman snake, who reappears so ubiquitously throughout Greece, the regular symbol of the underworld powers, especially the hero or dead ancestor. Why the snake was so chosen we can only surmise. He obviously lived underground: his home was among the Chthonioi, the Earth-People. Also, says the Scholiast to Aristophanes (_Plut._ 533), he was a type of new birth because he throws off his old skin and renews himself. And if that in itself is not enough to show his supernatural power, what normal earthly being could send his enemies to death by one little pin-prick, as some snakes can? In the Thesmophoria we found sacred swine, and the reason given by the ancients is no doubt the right one. The sow is sacred because of its fertility, and possibly as practical people we should add, because of its cheapness. Swine are always prominent in Greek agricultural rites. And the bull? Well, we modern town-dwellers have almost forgotten what a real bull is like. For so many centuries we have tamed him and penned him in, and utterly deposed him from his place as lord of the forest. The bull was the chief of magic or sacred animals in Greece, chief because of his enormous strength, his size, his rage, in fine, as anthropologists call it, his _mana_; that primitive word which comprises force, vitality, prestige, holiness, and power of magic, and which may belong equally to a lion, a chief, a medicine-man, or a battle-axe.