Read it through once

One beautiful night, when they had taken a longer walk than was customary with them: for the day had been unusually warm, and there was a brilliant moon, and a light wind had sprung up, which was unusually refreshing. Rose had been in high spirits, too, and they had walked on, in merry conversation, until they had far exceeded their ordinary bounds. Mrs. Maylie being fatigued, they returned more slowly home. The young lady merely throwing off her simple bonnet, sat down to the piano as usual. After running abstractedly over the keys for a few minutes, she fell into a low and very solemn air; and as she played it, they heard a sound as if she were weeping.