The unhappy student, with the one idea always fermenting on his brain, felt that the worst had come upon him. Without a moment's hesitation or thought he expressed his conviction that the compound was cacodyl.
Never did two men look more surprised, and never did two generally grave savants laugh more heartily than did the two examiners when they realized what the candidate had answered. Their mirth speedily brought him back to his senses. He saw with a feeling of despair that it was marsh gas which they had expected—one of the simplest and commonest of chemical combinations. Alas! it was too late now. He knew full well that nothing could save him. With poor marks in botany and zoology, such an error in chemistry was irreparable. He did what was perhaps the best thing under the circumstances. Rising from his chair he made a respectful bow to the examiners, and walked straight out of the room—to the great astonishment of the janitor, who had never before witnessed such a breach of decorum. As the student closed the door behind him he looked back and saw that the other professors had left their respective tables and were listening to an account of the incident from one of the chemists—and a roar of laughter the moment afterwards showed that they appreciated the humour of it. His fellow-students gathered round Tom outside in the hope of sharing in the joke, but he pushed them angrily aside and strode through the midst of them and down the University steps. He knew that the story would spread fast enough without his assistance. His mind was busy too in shaping a certain resolution which he had often thought over during the last few months.
The two old people and Miss Kate Harston waited long and anxiously in their sitting-room at the hotel for some news of the absentee. The doctor had, at first, attempted a lofty cynicism and general assumption of indifference, which rapidly broke down as the time went by, until at last he was wandering round the room, drumming upon the furniture with his fingers and showing every other sign of
