mythical world tree. The roots of this tree (usually growing in water) were guarded by Veles (Volos) the serpent god. The idea of snake-people living below the Earth was prominent in American myth. The Aztec underworld, Mictlan was protected by python-trees, a gigantic alligator and a snake, all of which spirits had to evade by physical ducking and weaving or cunning, before they could start the journey towards immortality. In North America, the Brule Sioux people told of three brothers transformed into rattlesnakes which permanently helped and guided their human relatives. The Pomo people told of a woman who married a rattlesnake-prince and gave birth to four snake-children who freely moved between the two worlds of their parents. The Hopi people told of a young man who ventured into the underworld and married a snake-princess. Snakes have been associated with Hecate, the Greek goddess of magic and the lower world. Water Snakes were also commonly associated with water especially myths about the primordial ocean being formed of a huge coiled snake as in Ahi/Vritra in early Indian myth and Jormungand in Nordic myth. Sea monsters lived in every ocean from the seven-headed crocodile-serpent Leviathan of Hebrew myth to the sea-god Koloowisi of the Zuni people of North America and the Greek monster Scylla with twelve snake-necks. In some cultures, eels (which spend their early lives in freshwater before returning to the sea as adults) were regarded as magical creatures. Rivers and lakes often had snake-gods or snake-guardians including Untekhi the fearsome water-spirit of the Missouri River. Until recently, some northern European communities held well dressing ceremonies to appease the snake-spirits which lived in village wells and told legends of saints defeating malevolent lake-snakes e.g. Saint George killing a maiden-devouring serpent or Saint Columba lecturing the Loch Ness Monster which then stopped eating humans and became shy of human visitors. Carved stones depicting a seven-headed cobra are commonly found near the sluices of the ancient irrigation tanks in Sri Lanka; these are believed to have been placed as guardians of the water. Wisdom Snakes were associated with wisdom in many mythologies, perhaps due to the appearance of pondering their actions as they prepare to strike, which was copied by medicine men in the build-up to prophecy in parts of West Africa. Usually the wisdom of snakes was regarded as ancient and beneficial towards humans but sometimes it could be directed against