Possibly the Ionians had adopted, in Asia, the Oriental idea of pollution and the Oriental mode of cleansing. Homer not only ignores, but knows not these things. Nor, I think, do we find purification in early Celtic and Teutonic and Scandinavian "saga."
We have more light on the method of purification from works of art. On an Apulian vase, Apollo holds a little pig above the head of the polluted matricide, Orestes, with one hand, in the other he grasps a long bough of laurel, which in Roman lustrations had a purifying effect. Melampus, on a Greek cameo, purifies the daughter of Proetus in the same fashion.[27]
NOTE
There is a singular case in which later tradition introduced purification where Homer says nothing about it. In Odyssey, xxi. 1-41, the poet explains how Odysseus came to possess the Bow of Eurytus. When he was but a lad he was sent to recover certain sheep stolen by men of Messenia. He met Iphitus, son of Eurytus, of Oechalia, looking for his lost mares and mules, and Iphitus presented him with the Bow. Thence Iphitus went to the house of Heracles in Tiryns, and there was murdered by his host.
Now we know at first hand, from Nestor himself (Iliad, xi. 685-692), that Heracles, before Nestor's first feat of arms, had attacked his family in Pylos, and that out of Nestor's twelve brothers he alone had escaped. "For the mighty Heracles had come and oppressed us, in former years, and all our best men were slain. For twelve sons were we of noble Neleus, whereof I alone was left, and all the others perished," but Neleus survived.
This feud of Heracles was a famous theme; the legend included the fairy story of Periclymenus, brother of Nestor. Poseidon had given him the gift of taking all sorts of shapes, but when he settled on the chariot of Heracles in the shape of a bee, Athene pointed out the bee to Heracles, who shot it. In Iliad, v. 393, we learn that Heracles once wounded Hades and Hera. The later Pylians conceived Nestor's wounding of Hades to have occurred at their town, when the hero attacked the household of Neleus. Nestor, in the passage quoted, says nothing about the help of Hades on this occasion, but Dione (v. 397) says that Heracles wounded Hades ἐν πύλῳ ἐν νεκύεσσι, "in Pylos among the dead." Aristarchus took this to mean in the gate, in the country of the dead. The incident would be part of the journey of Heracles to hell, to bring back "the dog" Cerberus. On this showing Homer is not saying that Hades fought vainly against Heracles in his raid on Nestor's town. But Homer never elsewhere uses pylos for "a gate."
The affair is confusing, but later legend associated Heracles's feud against Neleus with the rites of purification. Nestor does not tell us, but the Venetian scholiast on his speech does tell us that Neleus had refused to purify Heracles for the murder of Iphitus, his guest, under trust.[28]
Was the Homeric poet of Nestor's speech (xi. 693) ignorant of this "cause of wrath," and is it a later invention after the custom of purification came in; or did Homer "expurgate" a rite which he found in pre-Achaean tradition?