He took up his candle once more, kissed the portrait in the broken frame with intense fervour a dozen times over, and then went up gloomily into his own bedroom. There he did not attempt to undress, but merely pulled off his boots, lay down in his clothes upon the bed, and hastily blew out the candle. For a long time he lay tossing and turning in unspeakable terror; but at last, after perhaps two hours or so, he fell into a troubled sleep, and dreamed a hideous nightmare, in which somebody or other in shadowy outlines was trying perpetually to tear him away by main force from poor pale and weeping Hetty. It was daylight when Arthur woke again, and he lay for some time upon his bed, thinking over his last night's scare, which seemed much less serious, as such things always do, now that the sun had risen upon it. After a while his mind got round to the energy question; and, as he thought it over once more, the conviction forced itself afresh upon him that he was right upon the matter after all, and that if he was going mad there was at least method in his madness. So firmly was he convinced upon this point now (though he recognized that that very certainty might be merely a symptom of his coming malady) that he got up hurriedly, before the lodging-house servant came to clean up his little sitting-room, so as to rescue his crumpled foolscap from the waste-paper basket. After that, a bath and breakfast almost made him laugh at his evening terrors. All the morning Arthur Greatrex sat down at his table again, working in the algebraical calculations which he had omitted from his paper overnight, and finishing it in full form as if for presentation to a learned society. But he did not mean now to offer it to any society: he had a far deeper and more personal interest in the matter at present than that. He wanted to settle first of all the question whether he was going mad or not. Afterwards, there would be plenty of time to settle such minor theoretical problems as the general physical constitution of the universe.