Again, the manner in which the fire appears to have been originally kindled on these occasions has been alleged in support of the view that it was intended to be a mock-sun.  As some scholars have perceived, it is highly probable that at the periodic festivals in former times fire was universally obtained by the friction of two pieces of wood.[812] We have seen that it is still so procured in some places both at the Easter and the midsummer festivals, and that it is expressly said to have been formerly so procured at the Beltane celebration both in Scotland and Wales.[813] But what makes it nearly certain that this was once the invariable mode of kindling the fire at these periodic festivals is the analogy of the need-fire, which has almost always been produced by the friction of wood, and sometimes by the revolution of a wheel.  It is a plausible conjecture that the wheel employed for this purpose represents the sun,[814] and if the fires at the regularly recurring celebrations were formerly produced in the same way, it might be regarded as a confirmation of the view that they were originally sun-charms.  In point of fact there is, as Kuhn has indicated,[815] some evidence to shew that the midsummer fire was originally thus produced.  We have seen that many Hungarian swineherds make fire on Midsummer Eve by rotating a wheel round a wooden axle wrapt in hemp, and that they drive their pigs through the fire thus made.[816] At Obermedlingen, in Swabia, the “fire of heaven,” as it was called, was made on St. Vitus’s Day (the fifteenth of June) by igniting a cartwheel, which, smeared with pitch and plaited with straw, was fastened on a pole twelve feet high, the top of the pole being inserted in the nave of the wheel.  This fire was made on the summit of a mountain, and as the flame ascended, the people uttered a set form of words, with eyes and arms directed heavenward.[817] Here the fixing of a wheel on a pole and igniting it suggests that originally the fire was produced, as in the case of the need-fire, by the revolution of a wheel.  The day on which the ceremony takes place (the fifteenth of June) is near midsummer; and we have seen that in Masuren fire is, or used to be, actually made on Midsummer Day by turning a wheel rapidly about an oaken pole,[818] though it is not said that the new fire so obtained is used to light a bonfire.  However, we must bear in mind that in all such cases the use of a wheel may be merely a mechanical device to facilitate the operation of fire-making by increasing the friction; it need not have any symbolical significance.

[The influence which the fires are supposed to exert on the weather and vegetation may be thought to be due to an increase of solar heat produced by the fires.]