Halfway down the main corridor I have mentioned was the 'Middle-Third' class-room, a big square room with dingy cream-coloured walls, high windows darkened with soot, and a small stained writing-table at one end, surrounded on three sides by ranks of rugged seasoned forms and sloping desks; round the walls were varnished lockers with a number painted on the lid of each, and a big square stove stood in one corner. The only person in the room just then was the form-master, Mark Ashburn; and he was proposing to leave it almost immediately, for the close air and the strain of keeping order all day had given him a headache, and he was thinking that before walking homeward he would amuse himself with a magazine, or a gossip in the masters' room. Mark Ashburn was a young man, almost the youngest on the school staff, and very decidedly the best-looking. He was tall and well made, with black hair and eloquent dark eyes, which had the gift of expressing rather more than a rigid examination would have found inside him--just now, for example, a sentimental observer would have read in their glance round the bare deserted room the passionate protest of a soul conscious of genius against the hard fate which had placed him there, whereas he was in reality merely wondering whose hat that was on the row of pegs opposite. But if Mark was not a genius, there was a brilliancy in his manner that had something very captivating about it; an easy confidence in himself, that had the more merit because it had hitherto met with extremely small encouragement. He dressed carefully, which was not without effect upon his class, for boys, without being overscrupulous in the matter of their own costume, are apt to be critical of the garments of those in authority over them. To them he was 'an awful swell'; though he was not actually overdressed--it was only that he liked to walk home along Piccadilly with the air of a man who had just left his club and had nothing particular to do. He was not unpopular with his boys: he did not care twopence about any of them, but he felt it pleasant to be popular, and his careless good-nature secured that result without much effort on his part. They had a great respect for his acquirements too, speaking of him among themselves as 'jolly clever when he liked to show it'; for Mark was not above giving occasional indications of deep learning which were highly impressive. He went out of his way to do it, and was probably aware that the learning thus suggested would not stand any very severe test; but then there was no one there to apply it. Any curiosity as to the last hat and coat on the wall was satisfied while he still sat at his desk, for the door, with its upper panels of corrugated glass protected by stout wire network--no needless precaution there--opened just then, and a small boy appeared, looking rather pale and uncomfortable, and holding a long sheet of blue foolscap in one hand.