"She doesn't splash a bit, or make any clatter; so I guess she's a tidy creature," said Polly. "How long she does rub each spoon and glass. We never shall get done. What a fuss she makes with the napkins, laying them all even in the drawer. And now she's at the salt-cellars, doing them just as mamma likes. I wish she'd live here, and do my work for me. Why, what's that?" And Polly stopped fretting to listen; for she seemed to hear the sound of singing,--so sweet, and yet so very faint she could catch no words, and only make out a cheerful little tune. "Do you hear any one singing, mamma?" she asked. "No: I wish I did." And mamma sighed; for baby was poorly, piles of sewing lay waiting for her, Biddy was turning things topsy-turvy in the kitchen for want of a word from the mistress, and Polly was looking sullen. The little girl didn't say any more, but worked quietly and watched the shadow, feeling sure the faint song came from it. Presently she began to hum the tune she caught by snatches; and, before she knew it, she was singing away like a blackbird. Baby stopped crying, and mamma said, smiling: "Now I hear somebody singing, and it's the music I like best in the world." That pleased Polly; but, a minute after, she stopped smiling, for the shadow went and took baby, or seemed to, and Polly really did. Now, baby was heavy, and cross with its teeth; and Polly didn't feel like tending it one bit. Mamma hurried away to the kitchen; and Polly walked up and down the room with poor baby hanging over her arm, crying dismally, with a pin in its back, a wet bib under its chin, and nothing cold and hard to bite with its hot, aching gums, where the little teeth were trying to come through. "Do stop, you naughty, fretty baby. I'm tired of your screaming, and it's high time you went to sleep. Bless me! what's Miss Shadow doing with _her_ baby?" said Polly. Miss Shadow took out the big pin and laid it away, put on a dry bib, and gave _her_ baby a nice ivory ring to bite; then began to dance up and down the room, till the shadowy baby clapped its hands and kicked delightedly. Polly laughed, and did the same, feeling sorry she had been so pettish. Presently both babies grew quiet, went to sleep, and were laid in the cradle. "Now, I hope we shall rest a little," said Polly, stretching her arms. But, no: down sat the shadow, and began to sew, making her needle fly like a real little seamstress. "Oh, dear!" groaned Polly. "I promised to hem those handkerchiefs for Ned, and so I must; but I do think handkerchiefs are the most pokey things in the world to sew. I dare say you think you can sew faster than I can. Just wait a bit, and see what I can do, miss," she said to the shadow. It took some time to find her thimble and needles and spools, for Polly wasn't a very neat little girl; but she got settled at last, and stitched away as if bent on beating her dumb friend.