A dull red spot began to creep up into the German student's face. He was still holding the locker door with one hand. His eye travelled from the diagram to Walter and then back again. Walter stood very erect, his head thrown back almost defiantly now that he had made his confession, and he was absolutely in the dark as to the effect of it on Bauer. He would and could not blame him for being angry. And he was angry for a moment. But only a moment. Then his great brown eyes softened and he said in a quiet, gentle way that moved Walter more than any burst of passion could have done: "I am not a judge for you. While on the way home I suddenly thought out the secret of the metal teeth. See! I have it here." He took out of his pocket a paper and opening it spread it out on Walter's desk. Walter saw in a second's glance that Bauer had discovered the working basis for the successful light. "And I was going to work on the plan when I came back. But all my trouble drove it away. I lost my ambition. And I understand what you did. I might have done the same. But still, Douglas, do you know, I don't care. I--I am hungry for a friend just like you. What you have said does not change anything. What difference does that make? That is not trouble, not for me." Walter looked at him a moment and then in the reaction which was really the taking off of the strain of weeks, he put his head between his hands and sobbed. Bauer did not venture to say anything. When Walter could control himself he reached out his hand. Bauer took it, and in that grasp the two young men understood each other for life. I think each gave as much as he took. The sacred compact they sealed in the big empty shop that night was made with few words, but it was never disturbed nor broken in after years. And each one of them realised something of the depth and joy of real friendship. Do you? Does anybody? Our human friendships, when they are real and permanent, are the finest and richest possessions of our lives. Pity we treat them so lightly and measure them so tamely. That same night Bauer in his simple manner told Walter something more of his home troubles, enough to give Walter a glimpse into the real sorrow of his heart. Walter in his turn told in part the story of his temptation and of his struggles and tortures to escape. To this Bauer listened with a faint smile and with perfect understanding. In the days that followed, they agreed to construct the lamp between them and share in the profits from it. And when they began work on the mechanism each found that the other had discovered little improvements which were necessary to the best construction, finally producing a lamp far more perfect and practical than Walter's first attempt. The day after that memorable scene with Bauer in the shop Walter wrote home a long and exuberant letter, a part of which we may read.