It was Christmas morning; and Nelly March and her brother Rob were lying wide awake in their beds, wondering if it would do for them to get up and look in their stockings to see what Santa Claus had brought them. Nelly and Rob were twins; but you would never have thought so, when you looked at them, for Nelly was half a head taller than Rob, and a good deal heavier. She had always been well; but Rob had always been a delicate child. He was ill now...