Indeed, according to Bertram, Billy had been able to fill the Annex only by telling each prospective resident that he or she was absolutely necessary to the welfare and happiness of every other resident.

Not that the house was full, either.

There were still two unoccupied rooms.
"But then, I'm glad there are," Billy had declared, "for there's sure to be some one that I'll want to send there." "Some _one_, did you say ?" Bertram had retorted, meaningly; but his wife had disdained to answer this.
Billy herself was frequently at the Annex.

She told Aunt Hannah that she had to come often to bring the happiness--it accumulated so fast.
Certainly she always found plenty to do there, whenever she came.

There was Aunt Hannah to be read to, Mrs.Greggory to be sung to, and Tommy Dunn to be listened to; for Tommy Dunn was always quivering with eagerness to play her his latest "piece." Billy knew that some day at the Annex she would meet Mr.M.J.
Arkwright; and she told herself that she hoped she should.
Billy had not seen Arkwright (except on the stage of the Boston Opera House) since the day he had left her presence in white-faced, stony-eyed misery after declaring his love for her, and learning of her engagement to Bertram.