Chumbley examines the magical lore, beliefs, and practices involving the 'toad-bone' amulet, a magical object which is literally what its name suggests: the bone of a toad. Throughout Europe and further afield, occult practices involving this amuletic type have occurred in various forms over a period of some two thousand years. Its recorded uses begin with Pliny's first century recipes for various frog/toad charms for love, protection, and agrarian fertility. Later, during the medieval, renaissance, and early modern periods, forms of a toad-derived amulet - a magical bone, stone, or powder - recur widely throughout the lore of magic, alchemy, and witchcraft. The occult prowess connected to the bone form of toad-derived amulets reaches an apotheosis in great Britain during the 19th and 20th centuries, when the bone is used in a ritual of magical self-initiation and becomes a veritable embodiment of control and power over the natural world. Chumbley's purpose here is to unravel this history and attempt to set it in context within the far broader field of European and, where appropriate, world-wide occult practice. This is the first academic study of this little-known aspect of folk magic.