But another great feature of the Celtic midsummer festival appears to have been the gathering of the sacred mistletoe by the Druids. The ceremony has been thus described by Pliny in a passage which has often been quoted. After enumerating the different kinds of mistletoe he proceeds: “In treating of this subject, the admiration in which the mistletoe is held throughout Gaul ought not to pass unnoticed. The Druids, for so they call their wizards, esteem nothing more sacred than the mistletoe and the tree on which it grows, provided only that the tree is an oak. But apart from this they choose oak-woods for their sacred groves and perform no sacred rites without oak-leaves; so that the very name of Druids may be regarded as a Greek appellation derived from their worship of the oak.(765) For they believe that whatever grows on these trees is sent from heaven, and is a sign that the tree has been chosen by the god himself. The mistletoe is very rarely to be met with; but when it is found, they gather it with solemn ceremony. This they do especially in the sixth month (the beginnings of their months and years are determined by the moon) and after the tree has passed the thirtieth year of its age, because by that time it has plenty of vigour, though it has not attained half its full size. After due preparations have been made for a sacrifice and a feast under the tree, they hail it as the universal healer and bring to the spot two white bulls, whose horns have never been bound before. A priest clad in a white robe climbs the tree and with a golden(766) sickle cuts the mistletoe, which is caught in a white cloth. Then they sacrifice the victims, praying that God may make his own gift to prosper with those upon whom he has bestowed it. They believe that a potion prepared from mistletoe will make barren animals to bring forth, and that the plant is a remedy against all poison.”(767)