Tom's bosom friend sat next him, suffering just as Tom had been, and now he was deeply and gratefully interested in this entertainment in an instant. This bosom friend was Joe Harper. The two boys were sworn friends all the week, and embattled enemies on Saturdays. Joe took a pin out of his lapel and began to assist in exercising the prisoner. The sport grew in interest momently. Soon Tom said that they were interfering with each other, and neither getting the fullest benefit of the tick. So he put Joe's slate on the desk and drew a line down the middle of it from top to bottom. "Now," said he, "as long as he is on your side you can stir him up and I'll let him alone; but if you let him get away and get on my side, you're to leave him alone as long as I can keep him from crossing over."