Perhaps a familiar example will illustrate this distinction. Two people start off for an afternoon’s walk. One sets out because he wishes to call upon a friend who lives on the other side of the wood. To pay this call is the object of his walk; for the friend is building a new house. As he walks along he is busy wondering how far it is advanced, whether the plasterers have finished their work; and as he returns home he is thinking about the house he has seen and how he himself, when he builds a house of his own, will plan it differently. In fact, the incident of his friend’s being engaged in building is what interests him, and has been throughout the afternoon the motive of his walk. His companion, on the other hand, agrees to go along with him, not so much because he is interested in the house, although he is to some extent, but mostly because he loves a walk. He enjoys the exhilaration of the exercise; he is fond of the wood through which they have to pass. He will have a chance to hunt for the first signs of spring--the early skunk-cabbage, the shy peep of the violet through the dead leaves underfoot, the rose blush of the maples overhead, the piping and flicker of the first bird-arrivals and so on. The real motive of his walk is the joy of exercise and of the beauties met with on the way. Visiting the house was but an excuse.