Late one brilliant April afternoon Professor Lucius Wilson stood at the head of Chestnut Street, looking about him with the pleased air of a man of taste who does not very often get to Boston. He had lived there as a student, but for twenty years and more, since he had been Professor of Philosophy in a Western university, he had seldom come East except to take a steamer for some foreign port. Wilson was standing quite still, contemplating with a whimsical smile the slanting street, with its worn paving, its irregular, gravely colored houses, and the row of naked trees on which the thin sunlight was still shining.