Thus it seems that at a remote age in the heart of Italy, beside the sweet Lake of Nemi, the same fiery tragedy was annually enacted which Italian merchants and soldiers were afterwards to witness among their rude kindred, the Celts of Gaul, and which, if the Roman eagles had ever swooped on Norway, might have been found repeated with little difference among the barbarous Aryans of the North. The rite was probably an essential feature in the ancient Aryan worship of the oak.
It only remains to ask, Why was the mistletoe called the Golden Bough? The whitish-yellow of the mistletoe berries is hardly enough to account for the name, for Virgil says that the bough was altogether golden, stems as well as leaves. Perhaps the name may be derived from the rich golden yellow which a bough of mistletoe assumes when it has been cut and kept for some months; the bright tint is not confined to the leaves, but spreads to the stalks as well, so that the whole branch appears to be indeed a Golden Bough. Breton peasants hang up great bunches of mistletoe in front of their cottages, and in the month of June these bunches are conspicuous for the bright golden tinge of their foliage. In some parts of Brittany, especially about Morbihan, branches of mistletoe are hung over the doors of stables and byres to protect the horses and cattle, probably against witchcraft.
The yellow colour of the withered bough may partly explain why the mistletoe has been sometimes supposed to possess the property of disclosing treasures in the earth; for on the principles of homoeopathic magic there is a natural affinity between a yellow bough and yellow gold. This suggestion is confirmed by the analogy of the marvellous properties popularly ascribed to the mythical fern-seed, which is popularly supposed to bloom like gold or fire on Midsummer Eve. Thus in Bohemia it is said that “on St. John’s Day fern-seed blooms with golden blossoms that gleam like fire.” Now it is a property of this mythical fern-seed that whoever has it, or will ascend a mountain holding it in his hand on Midsummer Eve, will discover a vein of gold or will see the treasures of the earth shining with a bluish flame. In Russia they say that if you succeed in catching the wondrous bloom of the fern at midnight on Midsummer Eve, you have only to throw it up into the air, and it will fall like a star on the very spot where a treasure lies hidden. In Brittany treasure-seekers gather fern-seed at midnight on Midsummer Eve, and keep it till Palm Sunday of the following year; then they strew the seed on the ground where they think a treasure is concealed. Tyrolese peasants imagine that hidden treasures can be seen glowing like flame on Midsummer Eve, and that fern-seed, gathered at this mystic season, with the usual precautions, will help to bring the buried gold to the surface. In the Swiss canton of Freiburg people used to watch beside a fern on St. John’s night in the hope of winning a treasure, which the devil himself sometimes brought to them. In Bohemia they say that he who procures the golden bloom of the fern at this season has thereby the key to all hidden treasures; and that if maidens will spread a cloth under the fast-fading bloom, red gold will drop into it. And in the Tryol and Bohemia if you place fern-seed among money, the money will never decrease, however much of it you spend. Sometimes the fern-seed is supposed to bloom on Christmas night, and whoever catches it will become very rich. In Styria they say that by gathering fern-seed on Christmas night you can force the devil to bring you a bag of money.
Thus, on the principle of like by like, fern-seed is supposed to discover gold because it is itself golden; and for a similar reason it enriches its possessor with an unfailing supply of gold. But while the fern-seed is described as golden, it is equally described as glowing and fiery. Hence, when we consider that two great days for gathering the fabulous seed are Midsummer Eve and Christmas—that is, the two solstices (for Christmas is nothing but an old heathen celebration of the winter solstice)—we are led to regard the fiery aspect of the fern-seed as primary, and its golden aspect as secondary and derivative. Fern-seed, in fact, would seem to be an emanation of the sun’s fire at the two turning-points of its course, the summer and winter solstices. This view is confirmed by a German story in which a hunter is said to have procured fern-seed by shooting at the sun on Midsummer Day at noon; three drops of blood fell down, which he caught in a white cloth, and these blood-drops were the fern-seed. Here the blood is clearly the blood of the sun, from which the fern-seed is thus directly derived. Thus it may be taken as probable that fern-seed is golden, because it is believed to be an emanation of the sun’s golden fire.
Now, like fern-seed, the mistletoe is gathered either at Midsummer or at Christmas—that is, either at the summer or at the winter solstice—and, like fern-seed, it is supposed to possess the power of revealing treasures in the earth. On Midsummer Eve people in Sweden make divining-rods of mistletoe, or of four different kinds of wood one of which must be mistletoe. The treasure-seeker places the rod on the ground after sundown, and when it rests directly over treasure, the rod begins to move as if it were alive. Now, if the mistletoe discovers gold, it must be in its character of the Golden Bough; and if it is gathered at the solstices, must not the Golden Bough, like the golden fern-seed, be an emanation of the sun’s fire? The question cannot be answered with a simple affirmative. We have seen that the old Aryans perhaps kindled the solstitial and other ceremonial fires in part as sun-charms, that is, with the intention of supplying the sun with fresh fire; and as these fires were usually made by the friction or combustion of oak-wood, it may have appeared to the ancient Aryan that the sun was periodically recruited from the fire which resided in the sacred oak. In other words, the oak may have seemed to him the original storehouse or reservoir of the fire which was from time to time drawn out to feed the sun. But if the life of the oak was conceived to be in the mistletoe, the mistletoe must on that view have contained the seed or germ of the fire which was elicited by friction from the wood of the oak. Thus, instead of saying that the mistletoe was an emanation of the sun’s fire, it might be more correct to say that the sun’s fire was regarded as an emanation of the mistletoe. No wonder, then, that the mistletoe shone with a golden splendour, and was called the Golden Bough. Probably, however, like fern-seed, it was thought to assume its golden aspect only at those stated times, especially midsummer, when fire was drawn from the oak to light up the sun. At Pulverbatch, in Shropshire, it was believed within living memory that the oak-tree blooms on Midsummer Eve and the blossom withers before daylight. A maiden who wishes to know her lot in marriage should spread a white cloth under the tree at night, and in the morning she will find a little dust, which is all that remains of the flower. She should place the pinch of dust under her pillow, and then her future husband will appear to her in her dreams. This fleeting bloom of the oak, if I am right, was probably the mistletoe in its character of the Golden Bough. The conjecture is confirmed by the observation that in Wales a real sprig of mistletoe gathered on Midsummer Eve is similarly placed under the pillow to induce prophetic dreams; and further the mode of catching the imaginary bloom of the oak in a white cloth is exactly that which was employed by the Druids to catch the real mistletoe when it dropped from the bough of the oak, severed by the golden sickle. As Shropshire borders on Wales, the belief that the oak blooms on Midsummer Eve may be Welsh in its immediate origin, though probably the belief is a fragment of the primitive Aryan creed. In some parts of Italy, as we saw, peasants still go out on Midsummer morning to search the oak-trees for the “oil of St. John,” which, like the mistletoe, heals all wounds, and is, perhaps, the mistletoe itself in its glorified aspect. Thus it is easy to understand how a title like the Golden Bough, so little descriptive of its usual appearance on the tree, should have been applied to the seemingly insignificant parasite. Further, we can perhaps see why in antiquity mistletoe was believed to possess the remarkable property of extinguishing fire, and why in Sweden it is still kept in houses as a safeguard against conflagration. Its fiery nature marks it out, on homoeopathic principles, as the best possible cure or preventive of injury by fire.
These considerations may partially explain why Virgil makes Aeneas carry a glorified bough of mistletoe with him on his descent into the gloomy subterranean world. The poet describes how at the very gates of hell there stretched a vast and gloomy wood, and how the hero, following the flight of two doves that lured him on, wandered into the depths of the immemorial forest till he saw afar off through the shadows of the trees the flickering light of the Golden Bough illuminating the matted boughs overhead. If the mistletoe, as a yellow withered bough in the sad autumn woods, was conceived to contain the seed of fire, what better companion could a forlorn wanderer in the nether shades take with him than a bough that would be a lamp to his feet as well as a rod and staff to his hands? Armed with it he might boldly confront the dreadful spectres that would cross his path on his adventurous journey. Hence when Aeneas, emerging from the forest, comes to the banks of Styx, winding slow with sluggish stream through the infernal marsh, and the surly ferryman refuses him passage in his boat, he has but to draw the Golden Bough from his bosom and hold it up, and straightway the blusterer quails at the sight and meekly receives the hero into his crazy bark, which sinks deep in the water under the unusual weight of the living man. Even in recent times, as we have seen, mistletoe has been deemed a protection against witches and trolls, and the ancients may well have credited it with the same magical virtue. And if the parasite can, as some of our peasants believe, open all locks, why should it not have served as an “open Sesame” in the hands of Aeneas to unlock the gates of death?
Now, too, we can conjecture why Virbius at Nemi came to be confounded with the sun. If Virbius was, as I have tried to show, a tree-spirit, he must have been the spirit of the oak on which grew the Golden Bough; for tradition represented him as the first of the Kings of the Wood. As an oak-spirit he must have been supposed periodically to rekindle the sun’s fire, and might therefore easily be confounded with the sun itself. Similarly we can explain why Balder, an oak-spirit, was described as “so fair of face and so shining that a light went forth from him,” and why he should have been so often taken to be the sun. And in general we may say that in primitive society, when the only known way of making fire is by the friction of wood, the savage must necessarily conceive of fire as a property stored away, like sap or juice, in trees, from which he has laboriously to extract it. The Senal Indians of California “profess to believe that the whole world was once a globe of fire, whence that element passed up into the trees, and now comes out whenever two pieces of wood are rubbed together.” Similarly the Maidu Indians of California hold that “the earth was primarily a globe of molten matter, and from that the principle of fire ascended through the roots into the trunk and branches of trees, whence the Indians can extract it by means of their drill.” In Namoluk, one of the Caroline Islands, they say that the art of making fire was taught men by the gods. Olofaet, the cunning master of flames, gave fire to the bird mwi and bade him carry it to earth in his bill. So the bird flew from tree to tree and stored away the slumbering force of the fire in the wood, from which men can elicit it by friction. In the ancient Vedic hymns of India the fire-god Agni “is spoken of as born in wood, as the embryo of plants, or as distributed in plants. He is also said to have entered into all plants or to strive after them. When he is called the embryo of trees or of trees as well as plants, there may be a side-glance at the fire produced in forests by the friction of the boughs of trees.”
A tree which has been struck by lightning is naturally regarded by the savage as charged with a double or triple portion of fire; for has he not seen the mighty flash enter into the trunk with his own eyes? Hence perhaps we may explain some of the many superstitious beliefs concerning trees that have been struck by lightning. When the Thompson Indians of British Columbia wished to set fire to the houses of their enemies, they shot at them arrows which were either made from a tree that had been struck by lightning or had splinters of such wood attached to them. Wendish peasants of Saxony refuse to burn in their stoves the wood of trees that have been struck by lightning; they say that with such fuel the house would be burnt down. In like manner the Thonga of South Africa will not use such wood as fuel nor warm themselves at a fire which has been kindled with it. On the contrary, when lightning sets fire to a tree, the Winamwanga of Northern Rhodesia put out all the fires in the village and plaster the fireplaces afresh, while the head men convey the lightning-kindled fire to the chief, who prays over it. The chief then sends out the new fire to all his villages, and the villagers reward his messengers for the boon. This shows that they look upon fire kindled by lightning with reverence, and the reverence is intelligible, for they speak of thunder and lightning as God himself coming down to earth. Similarly the Maidu Indians of California believe that a Great Man created the world and all its inhabitants, and that lightning is nothing but the Great Man himself descending swiftly out of heaven and rending the trees with his flaming arms.
It is a plausible theory that the reverence which the ancient peoples of Europe paid to the oak, and the connexion which they traced between the tree and their sky-god, were derived from the much greater frequency with which the oak appears to be struck by lightning than any other tree of our European forests. This peculiarity of the tree has seemingly been established by a series of observations instituted within recent years by scientific enquirers who have no mythological theory to maintain. However we may explain it, whether by the easier passage of electricity through oak-wood than through any other timber, or in some other way, the fact itself may well have attracted the notice of our rude forefathers, who dwelt in the vast forests which then covered a large part of Europe; and they might naturally account for it in their simple religious way by supposing that the great sky-god, whom they worshipped and whose awful voice they heard in the roll of thunder, loved the oak above all the trees of the wood and often descended into it from the murky cloud in a flash of lightning, leaving a token of his presence or of his passage in the riven and blackened trunk and the blasted foliage. Such trees would thenceforth be encircled by a nimbus of glory as the visible seats of the thundering sky-god. Certain it is that, like some savages, both Greeks and Romans identified their great god of the sky and of the oak with the lightning flash which struck the ground; and they regularly enclosed such a stricken spot and treated it thereafter as sacred. It is not rash to suppose that the ancestors of the Celts and Germans in the forests of Central Europe paid a like respect for like reasons to a blasted oak.
This explanation of the Aryan reverence for the oak and of the association of the tree with the great god of the thunder and the sky, was suggested or implied long ago by Jacob Grimm, and has been in recent years powerfully reinforced by Mr. W. Warde Fowler. It appears to be simpler and more probable than the explanation which I formerly adopted, namely, that the oak was worshipped primarily for the many benefits which our rude forefathers derived from the tree, particularly for the fire which they drew by friction from its wood; and that the connexion of the oak with the sky was an after-thought based on the belief that the flash of lightning was nothing but the spark which the sky-god up aloft elicited by rubbing two pieces of oak-wood against each other, just as his savage worshipper kindled fire in the forest on earth. On that theory the god of the thunder and the sky was derived from the original god of the oak; on the present theory, which I now prefer, the god of the sky and the thunder was the great original deity of our Aryan ancestors, and his association with the oak was merely an inference based on the frequency with which the oak was seen to be struck by lightning. If the Aryans, as some think, roamed the wide steppes of Russia or Central Asia with their flocks and herds before they plunged into the gloom of the European forests, they may have worshipped the god of the blue or cloudy firmament and the flashing thunderbolt long before they thought of associating him with the blasted oaks in their new home.