Nelly had often heard the words, but did not quite understand what they meant. So Will told her of that great never-failing charity, to which thousands owe their lives; and the child listened with lips apart, eyes often full, and so much love and admiration in her heart that she could find no words in which to tell it. When her brother paused, she said earnestly: "Yes, I will be a Sanitary. This little cart of mine shall be my amb'lance, and I'll never let my water-barrels go empty, never drive too fast, or be rough with my poor passengers, like some of the men you tell about. Does this look like an ambulance, Will?" "Not a bit, but it shall, if you and mamma like to help me. I want four long bits of cane, a square of white cloth, some pieces of thin wood, and the gum-pot," said Will, sitting up to examine the little cart, feeling like a boy again as he took out his knife and began to whittle. Upstairs and downstairs ran Nelly till all necessary materials were collected, and almost breathlessly she watched her brother arch the canes over the cart, cover them with the cloth, and fit an upper shelf of small compartments, each lined with cotton-wool to serve as beds for wounded insects, lest they should hurt one another or jostle out. The lower part was left free for any larger creatures which Nelly might find. Among her toys she had a tiny cask which only needed a peg to be water-tight; this was filled and fitted in before, because, as the small sufferers needed no seats, there was no place for it behind, and, as Nelly was both horse and driver, it was more convenient in front. On each side of it stood a box of stores. In one were minute rollers, as bandages are called, a few bottles not yet filled, and a wee doll's jar of cold-cream, because Nelly could not feel that her outfit was complete without a medicine-chest. The other box was full of crumbs, bits of sugar, bird-seed, and grains of wheat and corn, lest any famished stranger should die for want of food before she got it home. Then mamma painted "U.S. San. Com." in bright letters on the cover, and Nelly received her charitable plaything with a long sigh of satisfaction. "Nine o'clock already. Bless me, what a short evening this has been," exclaimed Will, as Nelly came to give him her good-night kiss. "And such a happy one," she answered. "Thank you very, very much, dear Will. I only wish my little amb'lance was big enough for you to go in,--I'd so like to give you the first ride." "Nothing I should like better, if it were possible, though I've a prejudice against ambulances in general. But as I cannot ride, I'll try and hop out to your hospital to-morrow, and see how you get on,"--which was a great deal for Captain Will to say, because he had been too listless to leave his sofa for several days.