"Q. E. D.; yes, Q. E. D., laddies, we have carried the argument to its conclusion according to the principles of things, and the book is finished. There is still seven minutes of the hour remaining, we will spend it in revising the work of the Senior Algebra Class." Their work has not been revised unto this day, for at that moment the door opened without any one knocking, and without any one offering an apology, and William Pirie, Master of Arts of Edinburgh, and scholar of Trinity College, Cambridge, and Duncan Robertson, 2nd Lieutenant in the Perthshire Buffs, made their appearance, accompanied by Bailie MacConachie, whose dignity was fearsome; the Count, who waved his hand gracefully to the school, and Mr. McGuffie, who included everybody in an affable nod; and behind this imposing deputation every boy of Muirtown Seminary who was not already in the mathematical class-room. Bulldog turned upon them like a lion caught in a snare, and if he had had only thirty seconds preparation, it is firmly believed he would have driven the whole deputation, old and young, out of the class-room and dealt with the conspirators who remained unto the setting of the sun. But it was a cunning plot, arranged and timed with minute care, and before Bulldog could say a word Pirie had begun, and he knew better than to say much. "If we have offended you, sir, you will pardon us for it is our last offence, and we have this time a fair excuse. Your laddies could not let you leave that desk and go out of this room for the last time without telling you that they are grateful, because you have tried to make them scholars, and to make them men. If any of us be able in after years to do our part well, we shall owe it more than anything else to your teaching and your discipline." Then Robertson, who was the other spokesman the four had chosen, began. "Can't make a speech, sir, it is not in my line, but everything Pirie said is true, and we are proud of our chief." "This," said Pirie, turning to the boys, "is the watch and chain which we ask the master to do us the honour of wearing through the days to come, and the inscription, sir," and now Pirie turned to the desk, "crowns our offence, but you will know how to read it!" "TO BULLDOG, WITH THE RESPECT AND AFFECTION OF HIS LADDIES." It was Bailie MacConachie--may everything be pardoned to him--who started the cheer; but it was Mr. McGuffie who led it over hedge and ditch, and it was of such a kind that the mathematical class-room had to be repaired before the beginning of next term. During the storm Bulldog stood with the watch in his hand, and his cheeks as white as his hair, and when at last there was silence he tried to speak, but the tender heart had broken the iron mask, and all he could say was "laddies."