Walter stared at Bauer as he sometimes had to when Bauer opened his philosophy unexpectedly. "I wonder what will happen to you, old man, when you fall in love, really and deeply?" "I wonder," said Bauer softly. "It will be interesting to watch you," said Walter laughing. "Same to you," said Bauer with some spirit. "We can watch each other," Walter continued. "I have no doubt you will bear watching," was Bauer's reply, wrung from him by the tense situation. Walter roared, and did not venture to say any more on that subject. But he went on to urge Bauer to answer his father's letter at once and give him power of attorney to act for him and make the best possible terms for his invention. Bauer promised before he left the room to do so, and on reaching his own room he at once set to work on the difficult business of answering his father on purely business grounds. Without making any definite promises or giving his father any authority to act for him, with characteristic caution he asked several questions about the patent laws, and especially about the possibility of undertaking the manufacture of the incubators on shares. He enclosed the letters he already had received from companies interested, none of which however had made him any positive offer, only sounding him in general as to his disposition to sell the patent rights on certain terms which had no very promising prospects of ready money. And it was money Bauer wanted,--not dim future prospects of the all-powerful medium of happiness or unhappiness. After his letter had been mailed, he felt a little uncertain about it all, but he was of a direct, straight-forward habit and once started in a course of action he seldom changed it. Once committed to the correspondence with his father he would hold to it, keeping it all on a cold business basis as if his father had no other relation to him, and letting the heartache take care of itself. It is astonishing how many heartaches do take care of themselves in this old world. Only, like Bauer's, they are apt to take care of themselves so poorly that the ache starves the heart out of house and home. Two days later, Walter, who was in his room going over some complicated formulae connected with Rausch's Dynamics, was interrupted by Bauer who came running in from his room across the hall waving a little slip of paper. "What do you think of that," he exclaimed with unusual excitement. Walter looked at the little yellow slip and read "One Thousand Dollars payable to Felix Bauer by Halstead, Burns & Co., of Washington." "They offer me that for my patent right, with a small percentage of profit on certain sales." Walter was excited in his turn and started to offer congratulations. But Bauer's next words broke in on him. "I'm going to send the check back. It's not enough and they know it."