phenomena first manifested themselves in sentient organisms, we are compelled therein to recognise the manifest presence of instinct—the appointed means (as before said) of bridging over the interval between the purely vegetative functions and the intelligent activities of sentient animal life. “Natural selection” is manifestly impotent to account for the existence of such a faculty as that of “instinct.” We have already seen that the hypothesis of “lapsed intelligence” is also impotent to account for it. Thus the most recently attempted explanation falls altogether to the ground. Nevertheless the theory of evolution renders it necessary to assume that as new species of animals were from time to time evolved, so also were new and appropriate instincts. How then are we to account for the origin of such new instincts? That a certain mystery attends such origin cannot be denied, but a parallel mystery attends all other kinds of vital phenomena. What can be more mysterious than the purely organic functions of animals? Though not truly instinctive, they are full of unconscious purpose, and so are akin to instinct. Our nutrition is a process of self-generation by which the various bodies which constitute our food become transformed into our own substance. This process is effected by what is called assimilation, by which process the ultimate substance, or parenchyma, of our own body and of the bodies transforms part of what is immediately external to it, into the parenchyma itself. Again, the process of secretion is, as it were, parallel to the process of alimentation or nutrition. In secretion, the body extracts from the blood new substances (the secretions) which do not exist _as such_ within it. In nutrition, the body extracts from the blood new substances (the various tissues) which do not exist _as such_ within it. The blood is not the only source of our nutrition, since it has the power of replenishing itself. Thus the living particles which form the ultimate substance of our body exercise a certain power of choice with respect to the contents of the fluids which come in contact with them. Such particles are not passive bodies; they are active living agents, and their action no one has yet really explained. Here, then, are a set of activities which, if duly pondered over, will be found to be fully as mysterious and inexplicable in their unconscious teleology as any phenomena of instinct as ordinarily understood. But there is another class of organic vital actions which also seem to have a decided affinity both to reflex action and to instinct, though they are not to be regarded as actual instances of either of these faculties. The actions I refer to are those which bring about the repair of injuries and the reproduction of lost parts. They are like reflex action inasmuch as they take place in perfect unconsciousness and without the will having any power over them. They are like instinct inasmuch as