are, and come into action as soon as the necessary growth of the parts involved is attained, without hesitation or tentative trial. They are ready made. The terms "instinct" and "instinctive" should be limited to the action of this inherited apparatus or mechanism. All animals, including man, have more or less of such an inherited instinctive nervous apparatus. Man, or for the matter of that an animal, may be "conscious" (in the sense of being "aware") of the stimulus given to this inherited apparatus, and of its related action, or he may be "unconscious" of either. The point is that we have here the "working" of an apparatus inherited in a complete working state; it is, therefore, what we call instinctive. On the other hand, there are in higher animals, and especially in man, a vast number of actions performed which are not the outcome of an inborn ready-made nervous mechanism. On the contrary, these actions are determined by a mechanism built up in the animal during its individual existence--a mechanism which is formed by its individual experience acting on its nerve-cells, and is the outcome of observation, comparison, and, more or less, of processes which we call judgment and reasoning. The persistence of this mechanism built up by the individual, as well as its continuous elaboration and development, is what we call "memory," unconscious or conscious. It is misleading to speak of "inherited memory" or "race memory," and to apply it in any way to the inherited mechanisms of instinct; the word should be reserved in its ordinary limitation to an individual's record. This new and superior apparatus appears to require a much larger bulk of brain-substance for its elaboration than that which is sufficient for the inherited mechanisms of instinct. It works in closer response to the innumerable details of the individual case, and so must be much more complicated, and we can well believe must require a larger instrument. Obviously it is an advantage to its possessor. He (be he animal or man) is provided not with a simple response suitable for the average of incidents in his life, but has, by the "education" due to the circumstances in which his individual life is carried on, formed an ever-increasing store of special little mechanisms, giving the useful or advantageous response which he has himself discovered to be appropriate to this or that sign, sound, colour, shape, smell, touch, or what not which may assail his senses. In proportion as the brain increases in volume (especially that part of it which is called "the cortex of the hemispheres") the animal to which that brain belongs loses--gets rid of--inherited mechanisms or instincts, and becomes "educable," that is to say, capable of forming for itself new individual brain mechanisms based on memorized experience.