The canonicals of the Arch-Druid were extremely gorgeous. On his head he wore a tiara of gold, in his girdle the gem of augury, on his breast the _ior morain_, or breast-plate of judgment; below it, the _glan neidr_, or draconic egg: on the forefinger of the right hand, the signet ring of the order; on the forefinger of the left, the gem of inspiration. Before him were borne the volume of esoteric mysteries, and the golden implement with which the mistletoe was gathered. His robe was of a white linen, with a broad purple border. The sickle with which the mistletoe was cut could not have been of gold, though so described. Stukeley maintains that the Druids cut the mistletoe with their upright hatchets of brass, called celts, put at the end of their staffs. The kind of mistletoe found to this day in Greece is the same with that found in England; and Sir James Smith, the distinguished botanist, contends that when the superstitions of the East travelled westward, our Druids adopted the Greek mistletoe as being more holy or efficacious than any other. The Druids, doubtless, dispensed the plant at a high price: "as late as the seventeenth century peculiar efficacy was attached to it, and a piece hung round the neck was considered a safeguard against witches." (_W. Sandys, F.S.A._) It is concluded that the Druids possessed some knowledge of arithmetic, using the Greek characters as figures, in the public and private computations mentioned by Cæsar; they were not unacquainted with mensuration, geometry, and geography, because, as judges, they decided disputes about the limits of fields, and are even said to have been engaged in determining the measure of the world. Their mechanical skill, and particularly their acquaintance with the lever, is generally argued from the enormous blocks of Stonehenge, and the numerous other massive erections of rude stone which are yet remaining in many parts of the kingdom, and which are commonly attributed to these times. The remains of the mystic monument of Stonehenge, which stands in the midst of Salisbury Plain, have been variously explained, as to the purpose for which Stonehenge was reared. When perfect, it consisted of two circles and two ellipses of upright stones, concentric, and environed by a bank and ditch; and outside this boundary, of a single upright stone, and a sacred way, _via sacra_, or cursus. One writer has beheld in Stonehenge a work of antediluvians, and another, a sanctuary of the Danes; and Inigo Jones, a temple of the Romans. By the Saxons it was termed _Stonhengist_, the hanging stones; and thence came Stonehenge, of which we have this terrible historic legend:--