By spontaneity is to be understood that kind of activity which springs from the nature of the being or thing which is active. A motion that is caused by pressure or push is not spontaneous; but a motion, the motive power of which resides in the moving object, is spontaneous. Thus a cart rolling down a hill by its own weight performs a spontaneous motion, but when drawn by horses moves, or rather is moved, by pull without any spontaneity.[42] Now everything that exists is possessed of certain qualities; its existence is of some definite, peculiar kind, and this its peculiar kind is the character of the thing. In the character of a thing lies the source of its spontaneous actions. The spontaneous actions of the chemical elements depend upon their qualities, which always react under certain circumstances in a definite way, and under the same conditions in the same way. The action of sulphur and quicksilver lies in the nature of these elements. Their union is not passive, but active. They _are_ not combined, but they _do_ combine. He who observes and studies nature cannot be blind to the fact that an inalienable, intrinsic power is resident in every thing that exists. This is true not only of organised life, but also of the chemical elements as well as of gravitating masses. The motion of a falling stone can, no more than the actions of oxydising substances, be considered as ultimately due to an extraneous pressure that makes them move by push, or to a _vis a tergo_ acting upon inert matter. These motions must be spontaneous; they are due to powers inherent in the nature of reality. They are self-motions, and in this sense we say that all nature is alive. The term “life” is here used in a broader sense than ordinarily. It means spontaneity or self-motion, while in its common signification the term “life” is restricted only to the spontaneous action of organised beings, i. e. of plants and animals. In order to distinguish life in the broader sense from the narrower or common acceptance of the term, we call the latter “organised life.” It is not impossible, and I consider it even as most probable, that the difference between Professor Haeckel and myself rests on a different usage of the term soul. But a vague or inconsistent usage of the term, unless we are especially careful in so defining it as to prevent misunderstandings, will inevitably beget errors. Thus the doctrine of Panpsychism is liable to lead to fantastic ideas, and to cause great confusion concerning the activity of what is generally called inanimate nature. Soul (as I understand the term) is a system of sentient symbols. The problem of the origin of the soul is solved as soon as we understand how feelings can acquire meaning.