This section is from the book "Ancient Legends, Mystic Charms, And Superstitions Of Ireland", by Jane Francesca Wilde. Also available from Amazon: Ancient Legends, Mystic Charms, And Superstitions Of Ireland.
Take nine pieces of young elder twig ; run a thread of silk of three strands through the pieces, each piece being an inch long. Tie this round the patient's neck next the skin. Should the thread break and the amulet fall, it must be buried deep in the earth and another amulet made like the first, for if once it touches the ground the charm is lost.
Take nine pieces of a dead man's skull, grind them to powder, and then mix with a decoction of wall rue. Give the patient a spoonful of this mixture every morning fasting, till the whole potion is swallowed. None must be left, or the dead man would come to look for the pieces of his skull.