According to one account, German tradition required that the midsummer fire should be lighted, not from a common hearth, but by the friction of two sorts of wood, namely oak and fir.[415] In some old farm-houses of the Surenthal and Winenthal, in Switzerland, a couple of holes or a whole row of them may be seen facing each other in the door-posts of the barn or stable. Sometimes the holes are smooth and round; sometimes they are deeply burnt and blackened. The explanation of them is this. About midsummer, but especially on Midsummer Day, two such holes are bored opposite each other, into which the extremities of a strong pole are fixed. The holes are then stuffed with tow steeped in resin and oil; a rope is looped round the pole, and two young men, who must be brothers or must have the same baptismal name, and must be of the same age, pull the ends of the rope backwards and forwards so as to make the pole revolve rapidly, till smoke and sparks issue from the two holes in the door-posts. The sparks are caught and blown up with tinder, and this is the new and pure fire, the appearance of which is greeted with cries of joy. Heaps of combustible materials are now ignited with the new fire, and blazing bundles are placed on boards and sent floating down the brook. The boys light torches at the new fire and run to fumigate the pastures. This is believed to drive away all the demons and witches that molest the cattle. Finally the torches are thrown in a heap on the meadow and allowed to burn out. On their way back the boys strew the ashes over the fields, which is supposed to make them fertile. If a farmer has taken possession of a new house, or if servants have changed masters, the boys fumigate the new abode and are rewarded by the farmer with a supper.[416] [Midsummer fires in Silesia; scaring away the witches.]