the murder, there is noticed confusion and delay, you may be sure that the conscious mind is interfering with the subconscious mind. The difference between the conscious and the subconscious mind is always possible to detect, and if you are permitted to be thorough in your experiments, you can make certain what is in the subconscious mind that the conscious mind is trying to conceal. Here, as everywhere in life, knowledge is power, and expert knowledge confers mastery over the shrewdest untrained mind. The only trouble is that under our present social system the trained mind is very apt to be working in the interest of class privilege. The psychologist who is employed by a great corporation, or by a police department, may be as little worthy of trust as a chemist who is engaged in making poison gases to be used by capitalist imperialism for the extermination of its rebellious slaves. But what this proves is not that scientific knowledge is untrustworthy, but merely that the workers must acquire it, they must have their own organizations and their own experiments in every field. To give knowledge to the masses of mankind, slow and painful as the process seems, is now the most important task confronting the enlightened thinker. The method of psychoanalysis gives us also much insight into the phenomena of genius, and the hope that we may ultimately come to understand it. At present we are embarrassed because genius is so often closely allied to eccentricity; the supernormal appears in connection with the subnormal--and it is often hard to tell them apart. Great poets and painters in revolt against a world of smug commercialism, adopt irresponsibility as their religion; they live in a world of their own, they dress like freaks, they refuse to pay their debts, or to be true to their wives. They are followed by a host of disciples, who adopt the defects of the master as a substitute for his qualities. And so there grows up a perverted notion of what genius is, and wholly false standards of artistic quality. There is nothing mankind needs more than sure and exact tests of mental superiority; not merely the ability to acquire languages and to solve mathematical equations, but the ability to carry in the mind intense emotions, while at the same time shaping and organizing them by the logical faculty, selecting masses of facts and weaving them into a pattern calculated to awaken the emotion in others. This is the last and greatest work of the human spirit, and to select the men who can do it, and foster their activity, is the ultimate purpose of all true science. CHAPTER XVII THE CONDUCT OF THE MIND (Concludes the Book of the Mind with a study of how to preserve and develop its powers for the protection of our lives and the lives of all men.)