Probably there never was a time in human history when there were not people who interpreted dreams, and you can still buy "dream books" for twenty-five cents, and learn that a white horse means that you are going to get a letter from your sweetheart tomorrow; then you can buy another dream book, telling you that a white horse means there is going to be a death in your family within the year. Naturally this prejudices thinking people against dream analysis; yet, dreams are facts, and every fact has its cause, and if you dream about a white horse, there must assuredly be some reason for your dreaming this particular thing. Of course we know that if you eat mince-pie and welsh-rabbit at midnight, you will dream about something terrible; but will it be snakes, or will it be a railroad wreck, or will it be white horses trampling over you? Obviously, it may be a million different unpleasant things; and what is it that picks out this or that from the infinite store of your memory, and brings it into the region of half-consciousness which we call the dream? Professor Freud's discovery is in brief that the dream is a wish-fulfillment. Our instincts present to our consciousness a great mass of impulses and desires, and among these the consciousness selects what it pleases, and represses and refuses to recognize or to act upon the others. But maybe these decisions are not altogether satisfactory to the subconsciousness. The mind of the body is in rebellion against the mind--shall we say of reason, or shall we say of society? The mind of society, otherwise known as the moral law, says that you shall be a good little boy, and shall go to school and learn what you are told, and on Sunday go to church and sit very still through a long sermon; whereas, the body of a boy would rather be a savage, hunting birds' nests and scalping enemies and exploring magic caves full of precious jewels. So the subconsciousness of the boy, balked and miserable, awaits its time, and finds its satisfaction when the boy is asleep and his moral censor has relaxed its control.