The belief that it was possible to call up the souls of the dead by means of spells was almost universal in antiquity. We know that even Saul, who had himself cut off those that had familiar spirits and the wizards out of the land, disguised himself and went with two others to consult the witch of En-dor; that she called up the spirit of Samuel at his request; that Samuel asked Saul, "Why hast thou disquieted me, to bring me up?" and then prophesied his ruin and death at the hands of the Philistines at Mount Gilboa. We find frequent references to the practice in classical literature. The elder Pliny[44] gives us the interesting information that spirits refuse to obey people afflicted with freckles.

There were always certain spots hallowed by tradition as particularly favourable to intercourse with the dead, or even as being actual entrances to the lower world. For instance, at Heraclea in Pontus there was a famous 7985;ο?ψυχομαντε?ον, or place where the souls of the dead could be conjured up and consulted, as Hercules was believed to have dragged

Cerberus up to earth here. Other places supposed to be connected with this myth had a similar legend attached to them, as also did all places where Pluto was thought to have carried off Persephone. Thus we hear of entrances to Hades at Eleusis,[45] at Colonus,[46] at Enna in Sicily,[47] and finally at the lovely pool of Cyane, up the Anapus River, near Syracuse, one of the few streams in which the papyrus still flourishes.[48] Lakes and seas also were frequently believed to be entrances to Hades.[49]

The existence of sulphurous fumes easily gave rise to a belief that certain places were in direct communication with the lower world. This was the case at Cum? where ?neas consulted the Sybil, and at Colonus; while at Hierapolis in Phrygia there was a famous "Plutonium," which could only be safely approached by the priests of Cybele.[50] It was situated under a temple of Apollo, a real entrance to Hades; and it is doubtless to this that Cicero refers when he speaks of the deadly "Plutonia" he had seen in Asia.[51] These "Plutonia" or "Charonia" are, in fact, places where mephitic vapours exist, like the Grotto del Cane and other spots in the neighbourhood of Naples and Pozzuoli. The priests must either have become used to the fumes, or have learnt some means of counteracting them; otherwise their lives can hardly have been more pleasant than that of the unfortunate dog which used to be exhibited in the Naples grotto, though the control of these very realistic entrances to the kingdom of Pluto must have been a very profitable business, well worth a little personal inconvenience. Others are mentioned by Strabo at Magnesia and Myus,[52] and there was one at Cyllene, in Arcadia.

In addition to these there were numerous special temples or places where the souls of the dead, which were universally thought to possess a knowledge of the future, could be called up and consulted—e.g., the temple at Phigalia, in Arcadia, used by Pausanias, the Spartan commander;[53] or the νεκυομαντ?ιον, the oracle of the dead, by the River Acheron, in Threspotia, to which Periander, the famous tyrant of Corinth, had recourse;[54] and it was here, according to Pausanias, that Orpheus went down to the lower world in search of Eurydice.

Lucian[55] tells us that it was only with Pluto's permission that the dead could return to life, and they were invariably accompanied by Mercury. Consequently, both these gods were regularly invoked in the prayers and spells used on such occasions. Only the souls of those recently dead were, as a rule, called up, for it was naturally held that they would feel greater interest in the world they had just left, and in the friends and relations still alive, to whom they were really attached. Not that it was impossible to evoke the ghosts of those long dead, if it was desired. Even Orpheus and Cecrops were not beyond reach of call, and Apollonius of Tyana claimed to have raised the shade of Achilles.[56]

All oracles were originally sacred to Persephone and Pluto, and relied largely on necromancy, a snake being the emblem of prophetic power. Hence, when Apollo, the god of light, claimed possession of the oracles as the conqueror of darkness, the snake was twined round his tripod as an emblem, and his priestess was called Pythia. When Alexander set up his famous oracle, as described by Lucian, the first step taken in establishing its reputation was the finding of a live snake in an egg in a lake. The find had, of course, been previously arranged by Alexander and his confederates.

We still possess accounts of the working of these oracles of the dead, especially of the one connected with the Lake of Avernus, near Naples. Cicero[57] describes how, from this lake, "shades, the spirits of the dead, are summoned in the dense gloom of the mouth of Acheron with salt blood"; and Strabo quotes the early Greek historian Ephorus as relating how, even in his day, "the priests that raise the dead from Avernus live in underground dwellings, communicating with each other by subterranean passages, through which they led those who wished to consult the oracle hidden in the bowels of the earth." "Not far from the lake of Avernus," says Maximus of Tyre, "was an oracular cave, which took its name from the calling up of the dead. Those who came to consult the oracle, after repeating the sacred formula and offering libations and slaying victims, called upon the spirit of the friend or relation they wished to consult. Then it appeared, an unsubstantial shade, difficult both to see and to recognize, yet endowed with a human voice and skilled in prophecy. When it had answered the questions put to it, it vanished." One is at once struck with the similarity of this account to those of the spiritualistic séances of the famous Eusapia in the same part of the world, not so very long ago. In most cases those consulting the oracle would probably be satisfied with hearing the voice of the dead man, or with a vision of him in sleep, so that some knowledge of ventriloquism or power of hypnotism or suggestion would often be ample stock-in-trade for those in charge.

This consulting of the dead must have been very common in antiquity. Both Plato[58] and Euripides[59] mention it; and the belief that the dead have a knowledge of the future, which seems to be ingrained in human nature, gave these oracles great power. Thus, Cicero tells[60] us that Appius often consulted "soul-oracles" (psychomantia), and also mentions a man having recourse to one when his son was seriously ill.[61] The poets have, of course, made free use of this supposed prophetic power of the dead. The shade of Polydorus, for instance, speaks the prologue of the Hecuba, while the appearance of the dead Creusa in the ?neid is known to everyone. In the Pers?, ?schylus makes the shade of Darius ignorant of all that has happened since his death, and is thus able to introduce his famous description of the battle of Salamis; but Darius, nevertheless, possesses a knowledge of the future, and can therefore give us an equally vivid account of the battle of Plat?a, which had not yet taken place. The shade of Clytemnestra in the Eumenides, however, does not prophesy.

Pliny mentions the belief that the dead had prophetic powers, but declares that they could not always be relied on, as the following instance proves.[62] During the Sicilian war, Gabienus, the bravest man in C?sar's fleet, was captured by Sextus Pompeius, and beheaded by his orders. For a whole day the corpse lay upon the shore, the head almost severed from the body. Then, towards evening, a large crowd assembled, attracted by his groans and prayers; and he begged Sextus Pompeius either to come to him himself or to send some of his friends; for he had returned from the dead, and had something to tell him. Pompeius sent friends, and Gabienus informed them that Pompeius's cause found favour with the gods below, and was the right cause, and that he was bidden ............