“You understand, now,” he continued. “I burn, I suffer within, my pains are measureless and eternal, but my skin protects you and the globe from harm. Heat is power, energy, but is only useful to man when he can control it and graduate its application to his needs. You cannot do that with radium, now; it will not be prodigiously useful to you until polonium shall put the slave whip in your hand. I can release from my body the radium force in any measure I please, great or small; at my will I can set in motion the works of a lady’s watch or destroy a world. You saw me light that unholy cigar with my finger?” I remembered it. “Try to imagine how minute was the fraction of energy released to do that small thing! You are aware that everything is made up of restless and revolving molecules?--everything--furniture, rocks, water, iron, horses, men--everything that exists.” “Yes.” “Molecules of scores of different sizes and weights, but none of them big enough to be seen by help of any microscope?” “Yes.” “And that each molecule is made up of thousands of separate and never-resting little particles called atoms?” “Yes.” “And that up to recent times the smallest atom known to science was the hydrogen atom, which was a thousand times smaller than the atom that went to the building of any other molecule?” “Yes.” “Well, the radium atom from the positive pole is 5,000 times smaller than _that_ atom! This unspeakably minute atom is called an _electron_. Now then, out of my long affection for you and for your lineage, I will reveal to you a secret--a secret known to no scientist as yet--the secret of the firefly’s light and the glowworm’s; it is produced by a single electron imprisoned in a polonium atom.” “Sire, it is a wonderful thing, and the scientific world would be grateful to know this secret, which has baffled and defeated all its searchings for more than two centuries. To think!--a single electron, 5,000 times smaller than the invisible hydrogen atom, to produce that explosion of vivid light which makes the summer night so beautiful!” “And consider,” said Satan; “it is the only instance in all nature where radium exists in a pure state unencumbered by fettering alliances; where polonium enjoys the like emancipation; and where the pair are enabled to labor together in a gracious and beneficent and effective partnership. Suppose the protecting polonium envelope were removed; the radium spark would flash but once and the firefly would be consumed to vapor! Do you value this old iron letterpress?” “No, Majesty, for it is not mine.” “Then I will destroy it and let you see. I lit the ostensible cigar with the heat energy of a single electron, the equipment of a single lightning bug. I will turn on twenty thousand electrons now.”