In Druidical times there were rocking stones, or stones of judgment. They were large, some of them weighing fifty tons, and having sharp edges, on which they stood nicely balanced. A rocking stone of judgment, says Mr. Rust, "had been intended to test difficult questions, which could not be proved, disproved, or solved in the ordinary way, or for want of evidence, or which required the divine interposition of some particular deity, likely a bloodthirsty one; for as they had different deities, different temples, and different altars, they had also different judgment stones attached to them, and different ordeals through which the tried individuals, whether devotees, criminals, or captives, had to pass. These judgment stones had been anciently very common." According to the number of times a stone oscillated or refused to oscillate, the Druids determined to convict or acquit the suspected person. Of the misletoe, and the esteem in which it was held by the Druids, we have written in page 127. This parasitical plant was regarded as a charm of no ordinary virtue. But the misletoe was only one of many articles they had possessing occult virtue. Glass rings, manufactured by Druidical priests, were worn by the ancient Britons, as preventatives against witchcraft and the machinations of evil spirits. A ridiculous legend is told concerning Stonehenge, the supposed Druidical temple near Salisbury. Aurelianus Ambrosius, a famous general of the ancient Britons, of Roman extraction, was, at the request of the Britons, sent over with ten thousand men to assist them against the Saxons, whom Vortigern had invited into Britain. Ambrosius had such successes against the Saxons that the Britons chose him for their king, and compelled Vortigern to give up to him all the western parts of the kingdom divided by the Roman highway, called Watling Street. Ultimately Ambrosius became sole monarch of Britain. Geoffrey says that this monarch built Stonehenge. Ambrosius, we are told, coming to a monastery where lay buried three hundred British lords who had been massacred by Hengist, resolved to perpetuate the memory of this action by raising a monument over their remains.