Plutarch, indeed, shows the same faith in the existence of occult virtues in natural objects and in what may be called natural magic as most of his contemporaries. At his symposium when one man avers that he saw the tiny fish _echeneïs_ stop the ship upon which he was sailing until the lookout man picked it off,[963] some laugh at his credulity but others narrate other cases of strange antipathies in nature. Mad elephants are quieted by the sight of a ram; vipers will not move if touched with a leaf from a beech tree; wild bulls become tame when tied to a fig tree;[964] if light objects are oiled, amber fails to attract them as usual; and iron rubbed with garlic does not respond to the magnet. “These things are proved by experience but it is difficult if not quite impossible to learn their cause.” At the Symposium[965] the question also is raised why salt is called divine, and it is suggested that it may be because it preserves bodies from decay after the soul has left them, or because mice conceive without sexual intercourse by merely licking salt. In _The Delay of the Deity_ Plutarch again treats of occult virtues.[966] They pass from body to body with incredible swiftness or to an incredible distance. He wonders why it is that if a goat takes a piece of sea-holly in her mouth, the entire herd will stand still until the goatherd removes it. We see once more how closely such notions are associated with magical practices, when in the same paragraph he mentions the custom of making the children of those who have died of consumption or dropsy sit soaking their feet in water until the corpse has been buried so that they may not catch their parent’s disease. [Sidenote: Asbestos.]