"Here you are!" cried Lisa, coming to meet them at the front door. "You're good little girls to mind the baby for me. I'll take her now, and I thank you much." As Lisa spoke, she took hold of the Curtis carriage, which contained the Harrison baby. "Ah, she's asleep, bless her heart!" she exclaimed, looking at the closed eyes, almost hidden by the white veil. "I'm glad she's getting a fine nap. Run along now with your own baby." Partly confused by Lisa's quick and peremptory dismissal, and partly impelled by a sudden mischievous idea, Marjorie smiled a good-bye, and began trundling the other carriage toward the gate. "Why, Midge!" whispered Gladys, aghast. "We've got the wrong baby! This is Dotty Curtis!" "Keep still!" whispered Marjorie. "I know it. But it's a good joke on that snippy Lisa." "She wasn't snippy." "Yes, she was; she said 'Run along now, little girls,' after we've been helping her all the morning. She's going to let the baby stay asleep in the carriage, and she won't know it till she wakes up." "Who won't? The baby?" "No, Lisa. And then she'll be scared, and it will serve her right." "But what about Mrs. Harrison? You don't want to scare her." "That's just the thing," explained Marjorie. "I want to see if she'll know the difference in the babies. They say mothers can always tell their own children. Now we'll see." "It's a great joke," said Gladys, giggling. "But suppose they never find it out, and the children live with their wrong mothers all their lives!" "Don't be silly," said Marjorie. CHAPTER XIII A FAIR EXCHANGE? Mrs. Maynard opened the front door just as the children approached with the baby-carriage. "Come along, girlies!" she cried. "Marjorie, wheel the carriage right into the hall." "The baby's asleep, Mother," said Midget, as she and Gladys brought the carriage over the door-sill. "Oh, is she? Totty's asleep, Mildred," she called, in a stage whisper, to Mrs. Harrison, who was upstairs. "I thought she would be," responded that lady. "Just throw back her veil, and leave her as she is. She often takes her nap in her carriage, and there's no use waking her." Gently, Mrs. Maynard turned back the veil from the little sleeping face, and, as she had no thought of anything being wrong, she did not notice any difference in the baby features. "Gladys, we'd like to have you stay to luncheon," she said. "So you and Midge run upstairs and tidy your curls at once." With demure steps, but with dancing eyes, the girls went upstairs. "I'm afraid it's mischief," whispered Gladys to Marjorie, as she tied her hair-ribbon for her. "No, it isn't!" declared Midge, stoutly. "It's only a joke, and it can't do any harm. Mother didn't know it was a different baby, and I don't believe Mrs. Harrison will know either." Trim and tidy once more the two friends went downstairs. As they were on the stairs they heard the sound of the telephone bell.