"Yes," said Bauer, slower than usual. And at that moment Mrs. Douglas came in. "Are you willing to show this to mother?" asked Helen. "Certainly," said Bauer, smiling. "I am sure she will not betray my secret." Mrs. Douglas, who had instantly taken a great liking to Bauer from the moment of his arrival, was as enthusiastic as Helen and praised the inventor until he was well nigh overwhelmed. "I need all this encouragement to help me face Anderson. He will probably pick some flaw in it somewhere. He is merciless with all the fellows." "I don't see what a teacher is for," said Helen indignantly. "Half of the teachers I know pound at the students all the time instead of giving them encouragement." "They probably need it," said Mrs. Douglas, wisely. "Mr. Bauer is going to get rich with his invention," said Helen gaily. "I'll tell you what I will do, if it goes," said Bauer cheerfully. "I'll divide with Walter. We'll manufacture the incubator ourselves and so get all the profits." "Don't count your chickens before they are hatched," said Mrs. Douglas, and then added gratefully, "I appreciate that thought of Walter. The poor fellow seems to have lost his ambition since the affair of the arc light. I know you will do all you can to encourage him." "Indeed I will, Mrs. Douglas. I can't tell you how much I owe to Walter. He is like a brother to me." The minute he uttered the words he caught himself up and half turned, blushing furiously, towards Helen. But she had already started to go out of the library and Bauer was not sure that she had heard him or paid any attention. Mrs. Douglas, however, had seen his face and his half startled look and deepening colour, and her own face grew grave. It did not seem possible to her that anything serious could happen to the quiet German student during his brief stay with the family. And yet, she was a wise and observant woman who did not at all blind herself to the fact that her daughter had natural gifts of physical and mental attractions, which young men like Bauer inevitably feel. And it needed only this one glimpse of Bauer's face to reveal to her quick mother's sense the fact that Helen had attracted him, how far or how deeply for the loss of his own peace, of course she could not tell. It was partly on that account that Mrs. Douglas welcomed Helen's confidence when, that same afternoon, the girl came into her mother's room and after a few moments of nervous, restless and aimless talk came and sat down on a low chair near Mrs. Douglas and said, "Mother, I want a plain talk." "A plain talk" in the Douglas family meant heart secrets, and Mrs. Douglas knew at once what Helen wanted. "Hide nothing," said Esther, smiling, and patting Helen's head cheerfully. "Hide nothing," repeated Helen, with a faint smile; which meant that the utmost frankness was going to be shown on both sides.