Of this change the poor girl was at once aware, but she attributed it to a temporary absorption in his studies. Soon, however, she could not doubt that not merely was his voice or his countenance changed toward her, but that his heart had grown cold, and that he was no longer “friends with her.” For there was another and viler element than mere jealousy concerned in his alteration: he had become aware of a more real danger into which he was rapidly drifting—that of irrecoverably blasting the very dawn of his prospects by an imprudent marriage. “To saddle himself with a wife,” as he vulgarly expressed it, before he had gained his license—before even he had had the poorest opportunity of distinguishing himself in that wherein lay his every hope and ambition of proving his excellence, was a thing not for a moment to be contemplated! And now, when Isobel asked him in sorrowful mood some indifferent question, the uneasy knowledge that he was about to increase her sadness made him answer her roughly—a form not unnatural to incipient compunction: white as a ghost she stood a moment silently staring at him, then sank on the floor senseless. Seized with an overmastering repentance that brought back with a rush all his tenderness, James sprang to her, lifted her in his arms, laid her on the sofa, and lavished caresses upon her, until at length she recovered sufficiently to know where she lay—in the false paradise of his arms, with him kneeling over her in a passion of regret, the first passion he had ever felt or manifested toward her, pouring into her ear words of incoherent dismay—which, taking shape as she revived, soon became promises and vows. Thereupon the knowledge that he had committed himself, and the conviction that he was henceforth bound to one course in regard to her, wherein he seemed to himself incapable of falsehood, unhappily freed him from the self-restraint then most imperative upon him, and his trust in his own honour became the last loop of the snare about to entangle his and her very life. At the moment when a genuine love would have hastened to surround the woman with bulwarks of safety, he ceased to regard himself as his sister’s keeper. Even thus did Cain cease to be his brother’s keeper, and so slew him.