Hour after hour he sat and wrote, as if inspired, at his little table. The landlady knocked at the door to tell him dinner was ready, but he would have none of it, he said; let her bring him up a good cup of strong tea and a few plain biscuits. So he wrote and wrote in feverish haste, drinking cup after cup of tea, and turning off page after page of foolscap, till long past midnight. The whole theory had come up so distinctly before his mind's eye, under the exceptional exaltation of first love, and the powerful stimulus of the day's excitement, that he wrote it off as though he had it by heart; omitting only the mathematical calculations, which he left blank, not because he had not got them clearly in his head, but because he would not stop his flying pen to copy them all out then and there at full length, for fear of losing the main thread of his argument. When he had finished, about forty sheets of foolscap lay huddled together on the table before him, written in a hasty hand, and scarcely legible; but they contained the first rough draft and central principle of that immortal work, the "Transcendental Dynamics." Arthur Greatrex rose from the table, where his grand discovery was first formulated, well satisfied with himself and his theory, and fully determined to submit it shortly to the critical judgment of the Royal Society. As he took up his bedroom candle, however, he went over to the mantelpiece to kiss Hetty's photograph, as he always did (for even men of science are human) every evening before retiring. He lifted the portrait reverently to his lips, and was just about to kiss it, when suddenly in the mirror before him he saw the same horrible mocking face which had greeted him so unexpectedly that morning on the hospital staircase. It was a face of inhuman devilry; the face of a mediaeval demon, a hideous, grinning, distorted ghoul, a very caricature and insult upon the features of humanity. In his dismay he dropped the frame and the photograph, shivering the glass that covered it into a thousand atoms. Summoning up all his resolution, he looked again. Yes, there was no mistaking it: a face was gibing and jeering at him from the mirror with diabolical ingenuity of distorted hideousness; a disgusting face which even the direct evidence of his senses would scarcely permit him to believe was really the reflection of his own features. It was overpowering, it was awful, it was wholly incredible; and, utterly unmanned by the sight, he sank back into his easy-chair and buried his face bitterly between the shelter of his trembling hands. At that moment Arthur Greatrex felt sure he knew the real meaning of the horror that surrounded him. He was going mad.