(M71) Again, mistletoe acts as a master-key as well as a lightning-conductor; for it is said to open all locks.(280) However, in the Tyrol it can only exert this power “under certain circumstances,” which are not specified.(281) But perhaps the most precious of all the virtues of mistletoe is that it affords efficient protection against sorcery and witchcraft.(282) That, no doubt, is the reason why in Austria a twig of mistletoe is laid on the threshold as a preventive of nightmare;(283) and it may be the reason why in the north of England they say that if you wish your dairy to thrive you should give your bunch of mistletoe to the first cow that calves after New Year’s Day,(284) for it is well known that nothing is so fatal to milk and butter as witchcraft. Similarly in Wales, for the sake of ensuring good luck to the dairy, people used to give a branch of mistletoe to the first cow that gave birth to a calf after the first hour of the New Year; and in rural districts of Wales, where mistletoe abounded, there was always a profusion of it in the farmhouses. When mistletoe was scarce, Welsh farmers used to say, “No mistletoe, no luck”; but if there was a fine crop of mistletoe, they expected a fine crop of corn.(285) In Sweden mistletoe is diligently sought after on St. John’s Eve, the people “believing it to be, in a high degree, possessed of mystic qualities; and that if a sprig of it be attached to the ceiling of the dwelling-house, the horse’s stall, or the cow’s crib, the Troll will then be powerless to injure either man or beast.”(286) (M72) With regard to the time when the mistletoe should be gathered opinions have varied. The Druids gathered it above all on the sixth day of the moon, the ancient Italians apparently on the first day of the moon.(287) In modern times some have preferred the full moon of March and others the waning moon of winter when the sun is in Sagittarius.(288) But the favourite time would seem to be Midsummer Eve or Midsummer Day. We have seen that both in France and Sweden special virtues are ascribed to mistletoe gathered at Midsummer.(289) The rule in Sweden is that “mistletoe must be cut on the night of Midsummer Eve when sun and moon stand in the sign of their might.”(290) Again, in Wales it was believed that a sprig of mistletoe gathered on St. John’s Eve (Midsummer Eve), or at any time before the berries appeared, would induce dreams of omen, both good and bad, if it were placed under the pillow of the sleeper.(291) Thus mistletoe is one of the many plants whose magical or medicinal virtues are believed to culminate with the culmination of the sun on the longest day of the year. Hence it seems reasonable to conjecture that in the eyes of the Druids, also, who revered the plant so highly, the sacred mistletoe may have acquired a double portion of its mystic qualities at the solstice in June, and that accordingly they may have regularly cut it with solemn ceremony on Midsummer Eve.