From these considerations we see that the ultimate foundation of every form of matter is spirit, and hence that a universal intelligence subsists throughout Nature inherent in every one of its manifestations. But this cryptic intelligence does not belong to the particular _form_ excepting in the measure in which it is physically fitted for its concentration into self-recognizing individuality: it lies hidden in that primordial substance of which the visible form is a grosser manifestation. This primordial substance is a philosophical necessity, and we can only picture it to ourselves as something infinitely finer than the atoms which are themselves a philosophical inference of physical science: still, for want of a better word, we may conveniently speak of this primary intelligence inherent in the very substance of things as the Atomic Intelligence. The term may, perhaps, be open to some objections, but it will serve our present purpose as distinguishing _this_ mode of spirit's intelligence from that of the opposite pole, or Individual Intelligence. This distinction should be carefully noted because it is by the response of the atomic intelligence to the individual intelligence that thought-power is able to produce results on the material plane, as in the cure of disease by mental treatment, and the like. Intelligence manifests itself by responsiveness, and the whole action of the cosmic mind in bringing the evolutionary process from its first beginnings up to its present human stage is nothing else but a continual intelligent response to the demand which each stage in the progress has made for an adjustment between itself and its environment. Since, then, we have recognized the presence of a universal intelligence permeating all things, we must also recognize a corresponding responsiveness hidden deep down in their nature and ready to be called into action when appealed to. All mental treatment depends on this responsiveness of spirit in its lower degrees to higher degrees of itself. It is here that the difference between the mental scientist and the uninstructed person comes in; the former knows of this responsiveness and makes use of it, and the latter cannot use it because he does not know it. III THE UNITY OF THE SPIRIT.