In this famous myth, however, the god Hercules did not originally figure. The Latin Hercules was an essentially peaceful and domestic deity, watching over households and enclosures, and nearly akin to Terminus and the Penates. He does not appear to have been a solar divinity at all. But the purely accidental resemblance of his name to that of the Greek deity Herakles,[110] and the manifest identity of the Cacus-myth with the story of the victory of Herakles over Geryon, led to the substitution of Hercules for the original hero of the legend, who was none other than Jupiter, called by his Sabine name Sancus. Now Johannes Lydus informs us that, in Sabine, Sancus signified "the sky," a meaning which we have already seen to belong to the name Jupiter. The same substitution of the Greek hero for the Roman divinity led to the alteration of the name of the demon overcome by his thunderbolts. The corrupted title Cacus was supposed to be identical with the Greek word kakos, meaning "evil" and the corruption was suggested by the epithet of Herakles, Alexikakos, or "the averter of ill." Originally, however, the name was Caecius, "he who blinds or darkens," and it corresponds literally to the name of the Greek demon Kaikias, whom an old proverb, preserved by Aulus Gellius, describes as a stealer of the clouds.[111]

[110] There is nothing in common between the names Hercules and Herakles. The latter is a compound, formed like Themistokles; the former is a simple derivative from the root of hercere, "to enclose." If Herakles had any equivalent in Latin, it would necessarily begin with S, and not with H, as septa corresponds to epta, sequor to epomai, etc. It should be noted, however, that Mommsen, in the fourth edition of his History, abandons this view, and observes: "Auch der griechische Herakles ist fruh als Herclus, Hercoles, Hercules in Italien einheimisch und dort in eigenthumlicher Weise aufgefasst worden, wie es scheint zunachst als Gott des gewagten Gewinns und der ausserordentlichen Vermogensvermehrung." Romische Geschichte, I. 181. One would gladly learn Mommsen's reasons for recurring to this apparently less defensible opinion.

[111] For the relations between Sancus and Herakles, see Preller, Romische Mythologie, p. 635; Vollmer, Mythologie, p. 970.

Thus the significance of the myth becomes apparent. The three-headed Cacus is seen to be a near kinsman of Geryon's three-headed dog Orthros, and of the three-headed Kerberos, the hell-hound who guards the dark regions below the horizon. He is the original werewolf or Rakshasa, the fiend of the storm who steals the bright cattle of Helios, and hides them in the black cavernous rock, from which they are afterwards rescued by the schamir or lightning-stone of the solar hero. The physical character of the myth is apparent even in the description of Virgil, which reads wonderfully like a Vedic hymn in celebration of the exploits of Indra. But when we turn to the Veda itself, we find the correctness of the interpretation demonstrated again and again, with inexhaustible prodigality of evidence. Here we encounter again the three-headed Orthros under the identical title of Vritra, "he who shrouds or envelops," called also Cushna, "he who parches," Pani, "the robber," and Ahi, "the strangler." In many hymns of the Rig-Veda the story is told over and over, like a musical theme arranged with variations. Indra, the god of light, is a herdsman who tends a herd of bright golden or violet-coloured cattle. Vritra, a snake-like monster with three heads, steals them and hides them in a cavern, but Indra slays him as Jupiter slew Caecius, and the cows are recovered. The language of the myth is so significant, that the Hindu commentators of tile Veda have themselves given explanations of it similar to those proposed by modern philologists. To them the legend never became devoid of sense, as the myth of Geryon appeared to Greek scholars like Apollodoros.[112]

[112] Burnouf, Bhagavata-Purana, III. p. lxxxvi; Breal, op. cit. p. 98.

These celestial cattle, with their resplendent coats of purple and gold, are the clouds lit up by the solar rays; but the demon who steals them is not always the fiend of the storm, acting in that capacity. They are stolen every night by Vritra the concealer, and Caecius the darkener, and Indra is obliged to spend hours in looking for them, sending Sarama, the inconstant twilight, to negotiate for their recovery. Between the storm-myth and the myth of night and morning the resemblance is sometimes so close as to confuse the interpretation of the two. Many legends which Max Muller explains as myths of the victory of day over night are explained by Dr. Kuhn as storm-myths; and the disagreement between two such powerful champions would be a standing reproach to what is rather prematurely called the SCIENCE of comparative mythology, were it not easy to show that the difference is merely apparent and non-essential. It is the old story of the shield with two sides; and a comparison of the ideas fundamental to these myths will show that there is no valid ground for disagreement in the interpretation of them. The myths of schamir and the divining-rod, analyzed in a previous paper, explain the rending of the thunder-cloud and the procuring of water without especial reference to any struggle between opposing divinities. But in the myth of Hercules and Cacus, the fundamental idea is the victory of the solar god over the robber who steals the light. Now whether the robber carries off the light in the evening when Indra has gone to sleep, or boldly rears his black form against the sky during the daytime, causing darkness to spread over the earth, would make little difference to the framers of the myth. To a chicken a solar eclipse is the same thing as nightfall, and he goes to roost accordingly. Why, then, should the primitive thinker have made a distinction between the darkening of the sky caused by black clouds and that caused by the rotation of the earth? He had no more conception of the scientific explanation of these phenomena than the chicken has of the scientific explanation of an eclipse. For him it was enough to know that the solar radiance was stolen, in the one case as in the other, and to suspect that the same demon was to blame for both robberies.

The Veda itself sustains this view. It is certain that the victory of Indra over Vritra is essentially the same as his victory over the Panis. Vritra, the storm-fiend, is himself called one of the Panis; yet the latter are uniformly represented as night-demons. They steal Indra's golden cattle and drive them by circuitous paths to a dark hiding-place near the eastern horizon. Indra sends the dawn-nymph, Sarama, to search for them, but as she comes within sight of the dark stable, the Panis try to coax her to stay with them: "Let us make thee our sister, do not go away again; we will give thee part of the cows, O darling."[113] According to the text of this hymn, she scorns their solicitations, but elsewhere the fickle dawn-nymph is said to coquet with the powers of darkness. She does not care for their cows, but will take a drink of milk, if they will be so good as to get it for her. Then she goes back and tells Indra that she cannot find the cows. He kicks her with his foot, and she runs back to the Panis, followed by the god, who smites them all with his unerring arrows and recovers the stolen light. From such a simple beginning as this

has been deduced the Greek myth of the faithlessness of Helen.[114]