Further, the influence which these fires, whether periodic or occasional, are supposed to exert on the weather and vegetation may be cited in support of the view that they are sun-charms, since the effects ascribed to them resemble those of sunshine. Thus, the French belief that in a rainy June the lighting of the midsummer bonfires will cause the rain to cease appears to assume that they can disperse the dark clouds and make the sun to break out in radiant glory, drying the wet earth and dripping trees. Similarly the use of the need-fire by Swiss children on foggy days for the purpose of clearing away the mist may very naturally be interpreted as a sun-charm. In the Vosges Mountains the people believe that the midsummer fires help to preserve the fruits of the earth and ensure good crops. In Sweden the warmth or cold of the coming season is inferred from the direction in which the flames of the May Day bonfire are blown; if they blow to the south, it will be warm, if to the north, cold. No doubt at present the direction of the flames is regarded merely as an augury of the weather, not as a mode of influencing it. But we may be pretty sure that this is one of the cases in which magic has dwindled into divination. So in the Eifel Mountains, when the smoke blows towards the corn-fields, this is an omen that the harvest will be abundant. But the older view may have been not merely that the smoke and flames prognosticated, but that they actually produced an abundant harvest, the heat of the flames acting like sunshine on the corn. Perhaps it was with this view that people in the Isle of Man lit fires to windward of their fields in order that the smoke might blow over them. So in South Africa, about the month of April, the Matabeles light huge fires to the windward of their gardens, their idea being that the smoke, by passing over the crops, will assist the ripening of them. Among the Zulus also medicine is burned on a fire placed to windward of the garden, the fumigation which the plants in consequence receive being held to improve the crop. Again, the idea of our European peasants that the corn will grow well as far as the blaze of the bonfire is visible, may be interpreted as a remnant of the belief in the quickening and fertilising power of the bonfires. The same belief, it may be argued, reappears in the notion that embers taken from the bonfires and inserted in the fields will promote the growth of the crops, and it may be thought to underlie the customs of sowing flax-seed in the direction in which the flames blow, of mixing the ashes of the bonfire with the seed-corn at sowing, of scattering the ashes by themselves over the field to fertilise it, and of incorporating a piece of the Yule log in the plough to make the seeds thrive. The opinion that the flax or hemp will grow as high as the flames rise or the people leap over them belongs clearly to the same class of ideas. Again, at Konz, on the banks of the Moselle, if the blazing wheel which was trundled down the hillside reached the river without being extinguished, this was hailed as a proof that the vintage would be abundant.
So firmly was this belief held that the successful performance of the ceremony entitled the villagers to levy a tax upon the owners of the neighbouring vineyards. Here the unextinguished wheel might be taken to represent an unclouded sun, which in turn would portend an abundant vintage. So the waggon-load of white wine which the villagers received from the vineyards round about might pass for a payment for the sunshine which they had procured for the grapes. Similarly in the Vale of Glamorgan a blazing wheel used to be trundled down hill on Midsummer Day, and if the fire were extinguished before the wheel reached the foot of the hill, the people expected a bad harvest; whereas if the wheel kept alight all the way down and continued to blaze for a long time, the farmers looked forward to heavy crops that summer. Here, again, it is natural to suppose that the rustic mind traced a direct connexion between the fire of the wheel and the fire of the sun, on which the crops are dependent.
But in popular belief the quickening and fertilising influence of the bonfires is not limited to the vegetable world; it extends also to animals.