"Look here, boy, can you hold my horse a few minutes?" asked a gentleman, as he jumped from his carriage in one of the lower streets in New York. The boy addressed was apparently about twelve, with a bright face and laughing eyes, but dressed in clothes of coarse material. This was Jack Harding, who is to be our hero. "Yes, sir," said Jack, with alacrity, hastening to the horse's head; "I'll hold him as long as you like."