He had just rung and was waiting for an answer. The fanlight beat full upon the gleaming shoulders of his waterproof and upon his upturned features. It was a wan, sensitive, clear-cut face, with some subtle, nameless peculiarity in its expression, something of the startled horse in the white-rimmed eye, something too of the helpless child in the drawn cheek and the weakening of the lower lip. The man-servant knew the stranger as a patient at a bare glance at those frightened eyes. Such a look had been seen at that door many times before. "Is the doctor in?" The man hesitated. "He has had a few friends to dinner, sir. He does not like to be disturbed outside his usual hours, sir." "Tell him that I MUST see him. Tell him that it is of the very first importance. Here is my card." He fumbled with his trembling fingers in trying to draw one from his case. "Sir Francis Norton is the name. Tell him that Sir Francis Norton, of Deane Park, must see him without delay." "Yes, sir." The butler closed his fingers upon the card and the half-sovereign which accompanied it. "Better hang your coat up here in the hall. It is very wet. Now if you will wait here in the consulting-room, I have no doubt that I shall be able to send the doctor in to you." It was a large and lofty room in which the young baronet found himself. The carpet was so soft and thick that his feet made no sound as he walked across it. The two gas jets were turned only half-way up, and the dim light with the faint aromatic smell which filled the air had a vaguely religious suggestion. He sat down in a shining leather armchair by the smouldering fire and looked gloomily about him. Two sides of the room were taken up with books, fat and sombre, with broad gold lettering upon their backs. Beside him was the high, old-fashioned mantelpiece of white marble--the top of it strewed with cotton wadding and bandages, graduated measures, and little bottles. There was one with a broad neck just above him containing bluestone, and another narrower one with what looked like the ruins of a broken pipestem and "Caustic" outside upon a red label. Thermometers, hypodermic syringes bistouries and spatulas were scattered about both on the mantelpiece and on the central table on either side of the sloping desk. On the same table, to the right, stood copies of the five books which Dr. Horace Selby had written upon the subject with which his name is peculiarly associated, while on the left, on the top of a red medical directory, lay a huge glass model of a human eye the size of a turnip, which opened down the centre to expose the lens and double chamber within.