The Doctor's entrance put a stop to the talk, and presently Polly said good-bye, and went upstairs.
Not many days afterwards she was sent with a message to Mrs. Jocelyn's nurse, and the little lady caught sight of her at the door.
"Can't you come in and stay a while?" she called.
"I don't know," Polly hesitated, and she looked questioningly at the nurse.
"Yes, I wish you would," the young woman nodded. "I shall have to be away for a quarter of an hour or so, and if you will stay with Mrs. Jocelyn while I'm gone it will be an accommodation to me."
Polly seated herself smilingly.
"I wonder if you are as happy as you look," the little white-haired lady began.
"Oh, I'm always happy!" responded Polly; "that is, here," she added. "I could n't help being, it's so pleasant, and everybody is so good to me."
The dull gray eyes rested sadly on her. "Well, be happy while you can be," their owner said. "When you get to be old you'll forget what happiness feels like."
"Oh, but I shan't ever grow old!" laughed Polly. "Dr. Dudley and I are going to stay young!"