All of his brilliant exposition of the paradox of Rousseau and Robespierre (he was giving a course on the French Revolution), the strange and yet inevitable fact that the softest, most sentimental, rose-scented religion ever invented, should have produced, through its most thoroughly infatuated disciple, the ghastliest reign of terror that ever shocked the world; his masterly character study of the "sea-green incorruptible," too humane to swat a fly, yet capable of sending half of France to the guillotine in order that the half that was left might believe unanimously in the rights of man; all this the girl had let go by unheard, in favor, apparently, of the drone of a street piano, which came in through the open window on the prematurely warm March wind. Of all his philosophizing, there was not a pen-track to mar the virginity of the page she had opened her note-book to when the lecture began. And then, with a perfectly serious face, she had written down his silly little joke about advice to young girls. There was no reason in the world why she should be The Girl. There were fifteen or twenty of them in the class along with about as many men. And, partly because there was no reason for his paying any special attention to her, it annoyed him frightfully that he did. She was good-looking, of course--a rather boyishly splendid young creature of somewhere about twenty, with a heap of hair that had, in spite of its rather commonplace chestnut color, a sort of electric vitality about it. She was slightly prognathous, which gave a humorous lift to her otherwise sensible nose. She had good straight-looking, expressive eyes, too, and a big, wide, really beautiful mouth, with square white teeth in it, which, when she smiled or yawned--and she yawned more luxuriously than any girl who had ever sat in his classes--exerted a sort of hypnotic effect on him. All that, however, left unexplained the quality she had of making you, whatever she did, irresistibly aware of her. And, conversely, unaware of every one else about her. A bit of campus slang occurred to him as quite literally applicable to her. She had all the rest of them faded.