The logical consequence of this absorption in the problem of describing the phenomenal sequence of events, apart from inquiry into their ground, is that the more thoroughly the task is carried out the more completely does individuality disappear from the physical order as scientifically described. Everyday thought looks on the physical order as composed of interacting things, each of which is a unique individual; current science, with its insistence on the uniform behaviour of the different elements of the material world, inevitably dissolves this appearance of individuality. In the more familiar atomic theories, though the differences between the behaviour of the atoms of different elements are still retained as ultimate, the atoms of the same element are commonly thought of as exact replicas of each other, devoid of all individual uniqueness of behaviour. And in the attempts of contemporary science to get behind atomism, and to reduce all material existence to motions in a homogeneous medium, we see a still more radical consequence of the exclusive adoption of an attitude of description. Individuality has here disappeared entirely, except in so far as the origination of differential motion in a perfectly homogeneous medium remains an ultimate inexplicability which has to be accepted as a fact, but cannot be reconciled with the theoretical assumptions which have led to the insistence upon the homogeneity of the supposed medium. The logical reason for this progressive elimination of individuality from scientific descriptions of the processes of the physical order should now be manifest. If all individuality is that of individual subjects of experience, it is clear that in disregarding the question of the metaphysical ground of the physical order we have already in principle excluded all that gives it individuality from our purview; the more rigorously logical our procedure in dealing exclusively with the phenomenal contents of the physical order, the less room is left for any recognition of an element of individuality within it. Our purpose to describe the phenomenal logically involves description in purely general terms. It is only when, in Metaphysics, we seek to convert description of the phenomenal into interpretation of it as the appearance to sense of a more ultimate Reality, that the principle of the individuality of all real existence can come once more to its rights.