"That requires some thought," returned the Demon, and paused for several moments, while Rob feasted his eyes upon the gorgeous rays of color that flashed and vibrated in every direction and surrounded the figure of his visitor with an intense glow that resembled a halo. Then the Demon raised his head and said: "The thing most necessary to man is food to nourish his body. He passes a considerable part of his life in the struggle to procure food, to prepare it properly, and in the act of eating. This is not right. Your body can not be very valuable to you if all your time is required to feed it. I shall, therefore, present you, as my first gift, this box of tablets. Within each tablet are stored certain elements of electricity which are capable of nourishing a human body for a full day. All you need do is to toss one into your mouth each day and swallow it. It will nourish you, satisfy your hunger and build up your health and strength. The ordinary food of mankind is more or less injurious; this is entirely beneficial. Moreover, you may carry enough tablets in your pocket to last for months." Here he presented Rob the silver box of tablets, and the boy, somewhat nervously, thanked him for the gift. "The next requirement of man," continued the Demon, "is defense from his enemies. I notice with sorrow that men frequently have wars and kill one another. Also, even in civilized communities, man is in constant danger from highwaymen, cranks and policemen. To defend himself he uses heavy and dangerous guns, with which to destroy his enemies. This is wrong. He has no right to take away what he can not bestow; to destroy what he can not create. To kill a fellow-creature is a horrid crime, even if done in self-defense. Therefore, my second gift to you is this little tube. You may carry it within your pocket. Whenever an enemy threatens you, be it man or beast, simply point the tube and press this button in the handle. An electric current will instantly be directed upon your foe, rendering him wholly unconscious for the period of one hour. During that time you will have opportunity to escape. As for your enemy, after regaining consciousness he will suffer no inconvenience from the encounter beyond a slight headache." "That's fine!" said Rob, as he took the tube. It was scarcely six inches long, and hollow at one end. "The busy lives of men," proceeded the Demon, "require them to move about and travel in all directions. Yet to assist them there are only such crude and awkward machines as electric trolleys, cable cars, steam railways and automobiles. These crawl slowly over the uneven surface of the earth and frequently get out of order. It has grieved me that men have not yet discovered what even birds know: that the atmosphere offers them swift and easy means of traveling from one part of the earth's surface to another." "Some people have tried to build airships," remarked Rob.