"My dear sir," said Dyson, "I always like to be accurate. Your observation was perfectly correct. As you say, a youngish man, a man, I should say, of somewhat timid bearing, ran rapidly out of the shop here, and bounced into a hansom that must have been waiting for him, as it went eastwards at once. Your friend also wore spectacles, as you say. Perhaps you would like me to call a hansom for you to follow the gentleman?" "No, thank you; it would be waste of time." The man gulped down something which appeared to rise in his throat, and Dyson was alarmed to see him shaking with hysterical laughter, and he clung hard to a lamp-post and swayed and staggered like a ship in a heavy gale. "How shall I face the doctor?" he murmured to himself. "It is too hard to fail at the last moment." Then he seemed to recollect himself, and stood straight again, and looked quietly at Dyson. "I owe you an apology for my violence," he said at last. "Many men would not be so patient as you have been. Would you mind adding to your kindness by walking with me a little way? I feel a little sick; I think it's the sun." Dyson nodded assent, and devoted himself to a quiet scrutiny of this strange personage as they moved on together. The man was dressed in quiet taste, and the most scrupulous observer could find nothing amiss with the fashion or make of his clothes, yet, from his hat to his boots, everything seemed inappropriate. His silk hat, Dyson thought, should have been a high bowler of odious pattern worn with a baggy morning-coat, and an instinct told him that the fellow did not commonly carry a clean pocket-handkerchief. The face was not of the most agreeable pattern, and was in no way improved by a pair of bulbous chin-whiskers of a ginger hue, into which mustaches of light color merged imperceptibly. Yet in spite of these signals hung out by nature, Dyson felt that the individual beside him was something more than compact of vulgarity. He was struggling with himself, holding his feelings in check, but now and again passion would mount black to his face, and it was evidently by a supreme effort that he kept himself from raging like a madman. Dyson found something curious and a little terrible in the spectacle of an occult emotion thus striving for the mastery, and threatening to break out at every instant with violence, and they had gone some distance before the person whom he had met by so odd a hazard was able to speak quietly. "You are really very good," he said. "I apologize again; my rudeness was really most unjustifiable. I feel my conduct demands an explanation, and I shall be happy to give it you. Do you happen to know of any place near here where one could sit down? I should really be very glad." "My dear sir," said Dyson, solemnly, "the only café in London is close by. Pray do not consider yourself as bound to offer me any explanation, but at the same time I should be most happy to listen to you. Let us turn down here."