all the blows of their knives and axes would glance harmless from its surface. But once tear from the oak its sacred heart—the mistletoe—and the tree nodded to its fall. And when in later times the spirit of the oak came to be represented by a living man, it was logically necessary to suppose that, like the tree he personated, he could neither be killed nor wounded so long as the mistletoe remained uninjured. The pulling of the mistletoe was thus at once the signal and the cause of his death. But since the idea of a being whose life is thus, in a sense, outside itself, must be strange to many readers, and has, indeed, not yet been recognised in its full bearing on primitive superstition, it will be worth while to devote a couple of sections to the subject. The result will be to show that, in assuming this idea as the explanation of the relation of Balder to the mistletoe, I assume a principle which is deeply engraved on the mind of primitive man. § 3.—The external soul in folk-tales. In a former chapter we saw that, in the opinion of primitive people, the soul may temporarily absent itself from the body without causing death. Such temporary absences of the soul are often believed to involve considerable risk, since the wandering soul is liable to a variety of mishaps at the hands of enemies, and so forth. But there is another aspect to this power of externalising the soul. If only the safety of the soul can be ensured during its absence from the body, there is no reason why the soul should not continue absent for an indefinite time; indeed a man may, on a pure calculation of personal safety, desire that his soul should never return to his body. Unable to conceive of life abstractly as a “permanent possibility of sensation” or a “continuous adjustment of internal arrangements to external relations,” the savage thinks of it as a concrete material thing of a definite bulk, capable of being seen and handled, kept in a box or jar, and liable to be bruised, fractured, or smashed in pieces. It is not needful that the life, so conceived, should be in the man; it may be absent from his body and still continue to animate him, by virtue of a sort of sympathy or “action at a distance.” So long as this object which he calls his life or soul remains unharmed, the man is well; if it is injured, he suffers; if it is destroyed, he dies. Or, to put it otherwise, when a man is ill or dies, the fact is explained by saying that the material object called his life or soul, whether it be in his body or out of it, has either sustained injury or been destroyed. But there may be circumstances in which, if the life or soul remains in the man, it stands a greater chance of sustaining injury than if it were stowed away in some safe and secret place. Accordingly, in such circumstances, primitive man takes his soul out of his body and deposits it for security in some safe place, intending to replace it in his body when the danger is past.