Then he laughed hysterically and turned again to his machine. His whole attention was now fastened upon it, and with the true inventor's ecstasy he forgot Bauer, forgot his mother, forgot that he was at the center of a great moral tragedy for his own soul, forgot there was a God, and a judgment day and any such things as conscience or remorse, or injustice. His whole soul flung itself on that point of dazzling light and the soft metal teeth which he had coupled in a strip to the electrodes. He watched it, fascinated and fearful. He saw the tooth begin to glow to a red, then to a white, heat and then it melted softly away, letting the electrodes fall gently, keeping the points of their position in perfect place while the second tooth slipped down in turn to be transformed into a soft and yielding point. The lamp worked! It was a practical success! It had stood the test! He did not know how long he had been in the shop or how long he had been watching the mechanism. He switched off the power, and adjusted a part of the scissors-coupling. Then he turned on the current again and with the same feeling of fascination watched the softening and dissolving of the metal tooth. A noise of a door opening aroused him and he looked up. Someone had come in, and was walking directly toward his bench. The glare of the lamp blinded him, and his eyes had to become adjusted to the dimness as he turned his back on the lamp. But when the person was ten feet away he recognised in a moment the face of Bauer, as he came walking slowly toward him. CHAPTER V WALTER'S mind worked with what he afterward described to himself as an unquestioning obedience to a first impulse, at the centre of which was an instantaneous fear of discovery. Before Bauer had taken another step nearer him he had turned, switched off the power from the lamp, and snatched up a hammer from his bench. With one blow he smashed the electrodes and then, as if made frantic over the act, he struck at the mechanism until it was a heap of bent and twisted wires and metal. It lay on his bench in a tangled mass and he stooped over it and began to sweep it off into the refuse box. Bauer had not yet said a word. Only with the first blow of the hammer he had ejaculated "Ach!" As Walter was flinging bits of the lamp into the box the German student came up and stood near, looking at Walter in astonishment. "What is the matter?" Walter simply muttered some unintelligible thing. He was, to tell the truth, tremendously excited, disturbed, overwhelmed by Bauer's return at this particular time. "I've--I've been experimenting and have failed," he finally managed to say, stammering out the words with great difficulty. He was terrified to think Bauer might read in his face the whole story.