"Ah," interrupted the Clockwork man, placing a finger to the side of his nose, "I begin to understand. You work upon a different principle, or rather an antiquated principle. You see, all that has been solved now. The clock works all that out in advance. It calculates ahead of our conscious selves. No doubt we still go through the same processes, _sub-consciously_, all such processes that relate to Cause and Effect. But we, that is, ourselves, are the resultant of such calculations, and the only actions we are conscious of are those which are expressed as _consequents_." Allingham passed a hand across his forehead. "It all seems so feasible," he remarked, "once you grasp the mechanism. But what I don't understand--" Here, however, the discussion came to an abrupt conclusion, for something was happening to the Clockwork man. CHAPTER EIGHT THE CLOCK I At first it seemed to the Doctor that his companion was about to explain matters further. There was still something vaguely communicative about his manner, and a kind of noise issued from his rapidly moving jaws. But it was not a human noise. It began with a succession of deep-toned growls and grunts, and ended abruptly in a distinct bark. "Hydrophobia," flashed through the Doctor's mind, but he dismissed the idea immediately. He had lit a cigarette in order to soothe his nerves. He was trying so hard to rationalise the whole proceeding, to fit the Clockwork man into some remotely possible order of things; but it was a difficult process, for no sooner had he grouped certain ideas in his head than some fresh manifestation took place which rendered all previous theories futile. At the present moment, for instance, it was obvious that some new kind of structural alteration was taking place in the Clockwork man's physiognomy. The phenomenon could hardly be classed in the same category as the sudden growth of beard, although there were points in common. Hair was again visible, this time spread all over the rounded face and on the jaw; the nose was receding and flattening out; the eyes were dwindling in size, and the expression in them changed into a dull stare. The bark was repeated and followed by an angry rumbling. The Doctor dropped his cigarette on the plate before him and grasped the edges of the table. His eyes were riveted upon that ghastly spectacle of transmutation. "Oh, God," he cried out, at last, and shivering from head to foot. "Are you doing these things on purpose to frighten me, or can't you, _can't_ you help it? Do you think I don't believe you? Do you think I can keep on deceiving myself? I tell you I'm ready to believe anything--I capitulate--I only ask you to let me down lightly. I'm only human, and human nerves weren't made to stand this."