The wonder-working eggs possessed by the Druids were insignia of a sacred character, set in gold, and worn suspended from the neck. The Rev. John B. Pratt, in his work on the Druids, says: "These eggs were wholly artificial. Some of them were blue, some white, a third sort green, and a fourth regularly variegated with all these colours. They are said to have been worn by different orders--the white by the Druids; the blue by the presiding bards; the green by the Vains; and those with the three colours blended were pendants of the disciples. That the secret of manufacturing these amulets was totally unknown in Britain, except to the Druids, is thought most probable; and the secret of discovering things by looking into a globule of ink, which, it is asserted by some, the Egyptian jugglers still possess, may be a remnant of the ancient sortilege by means of the Druid's egg." Probably the coloured eggs children play with at Easter were anciently intended to represent the Druidical eggs. Mr. Pratt concludes, that if it be true that the Druids came from the East, and that the traces of their existence there run back, as some suppose, into the remotest antiquity, "it is not altogether preposterous," he continues, "to suppose that their origin is to be dated from the dispersion at Babel.... Balaam, the Eastern magician, was probably the Arch-Druid of the mountainous country in which he lived. The offerings he made were at the high places of Baal, and for the purpose of enchantments, although he was not ignorant of the Most High.... The magi, or wise men of the East, probably were Druids, who, from their knowledge of astronomy, at once detected the star which indicated the fulfilment of Balaam's prophecy." The earliest name borne by the island of Iona, so far as known in modern times, was Innis-nan Druidneach, or Isle of the Druids. The Druids retained their power not only in Iona until the year 563 or 564, but also on the mainland and in the islands. Mullingar is supposed to have been the last place in Ireland where the Druids had a residence. In the beginning of the last century a number of gold coins, found on the hill Karn Bre, near Truro, were thought to be Druidical coins. Some of them, Mr. Davies thinks, were impressed with rude hieroglyphics, symbolical of Ceridiven. Objects of different kinds are combined in one compound figure. To an arc or half moon is added the head of a bird, probably symbolical of the mother of the mystical egg. On other coins found there, magical ceremonies are represented, and on others the mystical sow appears sketched out.