Very soon Dering's brain became abnormally active; his busy thoughts took the shape of completed half-uttered sentences, and he argued with himself, not so loudly that those about him could hear, but still with moving lips, as to the outcome of what Louise had told him that evening. He was annoyed to find that his thoughts refused to marshal themselves in due sequence. Thus, when trying to concentrate his mind on the question of the immediate future, memories of Gerda Hinton, of the dead woman with whom he had never felt in sympathy, perhaps because Louise had been so fond of her, persistently intervened, and refused to be thrust away. His own present intolerable anguish made him, against his will, retrospectively understand Gerda's long-drawn-out agony. He remembered, with new sharp-edged concern and pity, her quiet endurance of those times of ignoble poverty brought about by Hinton's fits of idleness; he realised for the first time what must have meant, in anguish of body and mind, the woman's perpetual child bearing, and the deaths of two of her children, followed by her own within a fortnight of her last baby's birth. Then, with sudden irritation, he asked himself why he, Philip Dering, should waste his short time for thought in sorrowing over this poor dead woman? And, in swift answer, there came to him the knowledge why this sad drab ghost had thus thrust herself upon him to-night-- A feeling of furious anger, of revolt against the very existence of Jack Hinton, swept over him. So base, so treacherous, so selfish a creature fulfilled no useful purpose in the universe. Men hung murderers; and was Hinton, who had done his wife to death with refinement of cruelty, to go free--free to murder, in the same slow way, another woman, and one who actually belonged to Dering's own self? He now recognised, with bewilderment, that had Louise become his legal wife ten years ago, the thought of what she proposed to do would never have even crossed her mind. The conviction that Hinton was not fit to live soon formed itself into a stable background to all Dering's subsequent thoughts, to his short hesitations, and to his final determination. After a while he looked at his watch, and found, with some surprise, that he had been walking up and down for over an hour; he also became aware, for the first time, that his bare, hatless head provoked now and again good-natured comment from those among whom he was walking. He turned into a side-street, and taking from his pocket a small notebook, wrote the few lines which later played an important part in determining, to the satisfaction of his friends, the fact that he was, when writing them, most probably of unsound mind. What Dering wrote down in his pocket-book ran as follows: 1. I buy a hat at Dunn's, if Dunn be still open (which is probable).