If you open the chapter on Association, of any treatise on Psychology, you will read that a man’s ideas, aims, and objects form diverse internal groups and systems, relatively independent of one another. Each “aim” which he follows awakens a certain specific kind of interested excitement, and gathers a certain group of ideas together in subordination to it as its associates; and if the aims and excitements are distinct in kind, their groups of ideas may have little in common. When one group is present and engrosses the interest, all the ideas connected with other groups may be excluded from the mental field. The President of the United States when, with paddle, gun, and fishing‐rod, he goes camping in the wilderness for a vacation, changes his system of ideas from top to bottom. The presidential anxieties have lapsed into the background entirely; the official habits are replaced by the habits of a son of nature, and those who knew the man only as the strenuous magistrate would not “know him for the same person” if they saw him as the camper. If now he should never go back, and never again suffer political interests to gain dominion over him, he would be for practical intents and purposes a permanently transformed being. Our ordinary alterations of character, as we pass from one of our aims to another, are not commonly called transformations, because each of them is so rapidly succeeded by another in the reverse direction; but whenever one aim grows so stable as to expel definitively its previous rivals from the individual’s life, we tend to speak of the phenomenon, and perhaps to wonder at it, as a “transformation.”