There were nine Muses, inspirers of art and song. The Nymphs were beautiful maidens, who peopled the woods, the fields, the rivers, the lakes, and the ocean. Three Fates allotted life and death, and three Furies (Eumenides or Erinnyes) avenged crime, especially murder and unnatural crimes. The Gorgons were three sisters, with hair entwined with serpents. A single gaze upon them chilled the beholder to stone. Besides these there were Scylla and Charybdis, sea-monsters that made perilous the passage of the Sicilian Straits, the Centaurs, the Cyclops, Cerberus, the watch-dog of Hades, and a thousand others. Many at least of these monsters were simply personifications of the human passions or of the malign and destructive forces of nature. Thus, the Furies were the embodiment of an aroused and accusing conscience; the Gorgons were tempests, which lash the sea into a fury that paralyzes the affrighted sailor; Scylla and Charybdis were dangerous whirlpools off the coast of Sicily. To the common people at least, however, they were real creatures, with all the parts and habits given them by the poets. MODES OF DIVINE COMMUNICATION.--In the early ages the gods were wont, it was believed, to visit the earth and mingle with men. But even in Homer's time this familiar intercourse was a thing of the past--a tradition of a golden age that had passed away. Their forms were no longer seen, their voices no longer heard. In these later and more degenerate times the recognized modes of divine communication with men were by oracles, and by casual and unusual sights and sounds, as thunder and lightning, a sudden tempest, an eclipse, a flight of birds,--particularly of birds that mount to a great height, as these were supposed to know the secrets of the heavens,--the appearance or action of the sacrificial victims, or any strange coincidence. The art of interpreting these signs or omens was called the art of divination. ORACLES.--But though the gods might reveal their will and intentions through signs and portents, still they granted a more special communication of counsel through what were known as _oracles_. These communications, it was believed, were made by Zeus, and especially by Apollo, who was the god of prophecy, the Revealer. Not everywhere, but only in chosen places, did these gods manifest their presence and communicate the divine will. These favored spots were called oracles, as were also the responses there received. There were twenty-two oracles of Apollo in different parts of the Grecian world, but a much smaller number of those of Zeus. These were usually situated in wild and desolate spots--in dark forests or among gloomy mountains.