It was during one of these early summer visits, and directly after a tea-party which Marilla had proudly projected on Nan's account, that Dr. Leslie suddenly announced that he meant to go to Boston for a few days and should take Nan with him. This event had long been promised, but had seemed at length like the promise of happiness in a future world, reasonably certain, but a little vague and distant. It was a more important thing than anybody understood, for a dear and familiar chapter of life was ended when the expectant pair drove out of the village on their way to the far-off railway station, as another had been closed when the door of the Thacher farm-house had been shut and padlocked, and Nan had gone home one snowy night to live with the doctor. The weather at any rate was different now, for it was early June, the time when doctors can best give themselves a holiday; and though Dr. Leslie assured himself that he had little wish to take the journey, he felt it quite due to his ward that she should see a little more of the world, and happily due also to certain patients and his brother physicians that he should visit the instrument-makers' shops, and some bookstores; in fact there were a good many important errands to which it was just as well to attend in person. But he watched Nan's wide-open, delighted eyes, and observed her lack of surprise at strange sights, and her perfect readiness for the marvelous, with great amusement. He was touched and pleased because she cared most for what had concerned him; to be told where he lived and studied, and to see the places he had known best, roused most enthusiasm. An afternoon in a corner of the reading-room at the Athenæum library, in which he had spent delightful hours when he was a young man, seemed to please the young girl more than anything else. As he sat beside the table where he had gathered enough books and papers to last for many days, in his delight at taking up again his once familiar habit, Nan looked on with sympathetic eyes, or watched the squirrels in the trees of the quiet Granary Burying Ground, which seemed to her like a bit of country which the noisy city had caught and imprisoned. Now that she was fairly out in the world she felt a new, strange interest in her mysterious aunt, for it was this hitherto unknown space outside the borders of Oldfields to which her father and his people belonged. And as a charming old lady went by in a pretty carriage, the child's gaze followed her wistfully as she and the doctor were walking along the street. With a sudden blaze of imagination she had wished those pleasant eyes might have seen the likeness to her father, of which she had been sometimes told, and that the carriage had been hurried back, so that the long estrangement might be ended. It was a strange thing that, just afterward, Dr. Leslie had, with much dismay, caught sight of the true aunt; for Miss Anna Prince of Dunport had also seen fit to make one of her rare visits to Boston. She looked dignified and stately, but a little severe, as she went down the side street away from them. Nan's quick eyes had noticed already the difference between the city people and the country folks, and would have even recognized a certain provincialism in her father's sister. The doctor had only seen Miss Prince once many years before, but he had known her again with instinctive certainty, and Nan did not guess, though she was most grateful for it, why he reached for her hand, and held it fast as they walked together, just as he always used to do when she was a little girl. She was not yet fully grown, and she never suspected the sudden thrill of dread, and consciousness of the great battle of life which she must soon begin to fight, which all at once chilled the doctor's heart. "It's a cold world, a cold world," he had said to himself. "Only one thing will help her through safely, and that is her usefulness. She shall never be either a thief or a beggar of the world's favor if I can have my wish." And Nan, holding his hand with her warm, soft, childish one, looked up in his face, all unconscious that he thought with pity how unaware she was of the years to come, and of their difference to this sunshine holiday. "And yet I never was so happy at her age as I am this summer," the doctor told himself by way of cheer.