But the professor was gone, repeating to himself as he went down the garden walk, "The duckses' babies, indeed!" He chuckled as he said it, why I cannot tell. He was very particular about his grammar, was the professor, ordinarily. Perhaps it was because it was Christmas eve. Down town went the professor; but instead of going with the crowd that was setting toward Santa Claus's headquarters, in the big Broadway store, he turned off into a quieter street, leading west. It took him to a narrow thoroughfare, with five-story tenements frowning on their side, where the people he met were not so well dressed as those he had left behind, and did not seem to be in such a hurry of joyful anticipation of the holiday. Into one of the tenements he went, and, groping his way through a pitch-dark hall, came to a door way back, the last one to the left, at which he knocked. An expectant voice said, "Come in," and the professor pushed open the door. The room was very small, very stuffy, and very dark, so dark that a smoking kerosene lamp that burned on a table next the stove hardly lighted it at all, though it was broad day. A big, unshaven man, who sat on the bed, rose when he saw the visitor, and stood uncomfortably shifting his feet and avoiding the professor's eye. The latter's glance was serious, though not unkind, as he asked the woman with the baby if he had found no work yet. "No," she said, anxiously coming to the rescue, "not yet; he was waitin' for a recommend." But Johnnie had earned two dollars running errands, and, now there was a big fall of snow, his father might get a job of shovelling. The woman's face was worried, yet there was a cheerful note in her voice that somehow made the place seem less discouraging than it was. The baby she nursed was not much larger than a middle-sized doll. Its little face looked thin and wan. It had been very sick, she explained, but the doctor said it was mending now. That was good, said the professor, and patted one of the bigger children on the head. There were six of them, of all sizes, from Johnnie, who could run errands, down. They were busy fixing up a Christmas tree that half filled the room, though it was of the very smallest. Yet, it was a real Christmas tree, left over from the Sunday-school stock, and it was dressed up at that. Pictures from the colored supplement of a Sunday newspaper hung and stood on every branch, and three pieces of colored glass, suspended on threads that shone in the smoky lamplight, lent color and real beauty to the show. The children were greatly tickled. "John put it up," said the mother, by way of explanation, as the professor eyed it approvingly. "There ain't nothing to eat on it. If there was, it wouldn't be there a minute. The childer be always a-searchin' in it."