applications of the principles of movement and force are high, special functions of the intelligence. That people differ enormously in this skill, that it is not necessarily associated with other phases of intelligence are commonplaces. The dealer in abstract ideas of great value to the race may be unable to drive a nail straight, while the man who can build the most intricate mechanism out of crude iron, wood and metal may be unable to express any but the commonplaces of existence. Intelligence, acting through skill, has evolved machinery and the industrial evolution; acting to discover constant principles operating in experience, it has established science. Seeking to explain and control the world of unknown forces, it has evolved theory and practice. A very essential division of people is on the one hand those whose effort is to explain things, and who are called theorists, and those who seek to control things, the practical persons. There is a constant duel between these two types of personalities, and since the practical usually control the power of the world, the theorists and explainers have had rather a hard time of it, though they are slowly coming into their own. Another difference between minds is this: that intelligence deals with the relations between things (this being a prime function of speech), and intelligence only becomes intellect when it is able to see the world from the standpoint of abstract ideas, such as truth, beauty, love, honor, goodness, evil, justice, race, individual, etc. The wider one can generalize correctly, the higher the intellect. The practical man rarely seeks wide generalizations because the truth of these and their value can only be demonstrated through the course of long periods of time, during which no good to the individual himself is seen. Besides which, the practical man knows that the wide generalization may be an error. Practical aims are usually immediate aims, whereas the aims of intellect are essentially remote and may project beyond the life of the thinker himself.