(_a_) We tend to take with us, as we travel into bygone times, the dualistic hypothesis—which to most of us is no hypothesis, but an axiomatic truth—of the existence of an unbridged chasm between body and soul, matter and spirit. The relation in our minds of the idea of matter to the idea of spirit is such, that though we readily conceive matter to act upon matter, and spirit upon spirit, we find it difficult or impossible to conceive a direct action either of matter upon spirit or of spirit upon matter. When, therefore, in studying, for example, the ancient rites of baptism, we find expressions which seem to attribute a virtue to the material element, we measure such expressions by a modern standard, and regard them as containing only an analogy or a symbol. They belong, in reality, to another phase of thought than our own. They are an outflow of the earlier conception of matter and spirit as varying forms of a single substance.[6] “Whatever acts, is body,” it was said. Mind is the subtlest form of body, but it is body nevertheless. The conception of a direct action of the one upon the other presented no difficulty. It was imagined, for instance, that demons might be the direct causes of diseases, because the extreme tenuity of their substance enabled them to enter, and to exercise a malignant influence upon, the bodies of men. So water, when exorcized from all the evil influences which might reside in it, actually cleansed the soul.[7] The conception of the process as symbolical came with the growth of later ideas of the relation of matter to spirit. It is, so to speak, a rationalizing explanation of a conception which the world was tending to outgrow.