They all laughed at this often quoted blunder, and Harry began: "You see, Mother, that yesterday John Green contrived, while we were in school, and engaged in doing our lessons, to make a great B on Frank's and my back, with a piece of chalk. John is a good hand at such things, and he did it so nicely, that the master did not see him, and neither of us saw the B on the other. When we went out to play, all the boys cried out, "B for blockhead, B for blunderbuss, B for booby," and so on, ever so many other names beginning with B, and kept pointing at us. At last, I saw Frank's mark, and he saw mine. I can tell you we were both angry enough. Now we want to be revenged on John Green, and have a capital plan. You see he will be on his guard, and we must be very cunning. To-morrow is exhibition day, and he will have on his best dark-green jacket, and Frank and I are to sit one on each side of him. You see he is really a dunce about every thing but playing tricks; and, when he is asked a question, he will be scared out of his senses, and not know what to say. Now Frank is going to pretend to help him, while I write Dunce in large letters on the stupid fellow's back. John will not know what I am doing, I am sure; and, as he is a real dunce, it will make a good laugh; every one will think he is well served, and the whole school will make fun of him." "So," said Mrs. Chilton, "you acknowledge that you are planning a piece of revenge." "Why, yes, Mother," replied Frank; "I suppose you would think it ought to be called revenge, but I don't see any great harm in it. Schoolboys always play such tricks, and no boy thinks the worse of another for such a thing." "You think," said Mrs. Chilton, "that this schoolmate of yours will be so embarrassed at answering the questions that he will not know what he is about; you mean, one of you, to pretend to be his friend and help him, while the other makes him appear like a fool to the rest of the boys." Frank and Harry looked a little troubled, and were silent a while. Then Frank said, "It is no more than what John would do; 'tis what he deserves, and it is true enough that he is a dunce." "I will tell you, Frank, a better way of being revenged," replied his mother. "What is it, Mother?" "Sit by him, as you intended, and when he is troubled and perplexed, help him as well as you can, and be particularly kind to him." "And so reward him for making fools of us," said Prank, pettishly. "No, Mother, what you say may be very good, but I don't want to do such a thing as that." "If you were to treat him in the way I propose, do you think he would ever treat you unkindly again? Would he not feel deeply ashamed of his conduct if you thus returned him good for evil?" The boys were silent, but it was evident that they did not quite relish their mother's advice, nor feel at all disposed to help John Green say his lessons.