The young man's career from his twentieth to his thirtieth year had not departed from the conventional lines of his class. Ambition and great aptitude in his specialty had won him the protection of eminent scientists. He had been Professor Koch's assistant, and, without a rupture of their friendly relations, had also studied several semesters under Koch's opponent, Pettenkofer, in Munich. When he went to Rome for the purpose of investigating malaria, he met Mrs. Thorn and her daughter, who later became his wife and whose mind was now deranged. Angele Thorn brought him a considerable addition to his own small fortune. The delicacy of her constitution caused him, eventually, to move with her and the three children that had come to them to a healthy mountain district; but the change did not interfere with his scientific work or professional connections. Thus it was that in Munich, Berlin, and other scientific centres, he had been considered one of the most competent bacteriologists, a man whose career had passed the stage of the problematical. The worst against him--and that only in the opinion of the cut-and-dried among his fellow-scientists, who shook their heads doubtfully--had been a certain belletristic tendency. Now, however, that his abortive work had appeared and he had suffered his great defeat, all serious scientists said it was the cultivation of side interests that had weakened his strength and led the promising young intellect along the path of self-destruction. In his icy room in the English hotel, Frederick meditated on his past. "I see three threads which the Parcae have woven into my life. The snapping of the thread that represents my scientific career leaves me utterly indifferent. The bloody tearing of the other thread"--he had in mind his love for his wife--"makes the first event insignificant. But even though I should still hold a place among the most hopeful of the younger generation of scientists, the third thread, which is still whole, which pierces my soul like a live wire, would have nullified my ambitions and all my endeavours in science." The third thread was a passion. Frederick von Kammacher had gone to Paris to rid himself of this passion; but the object of it, the sixteen-year-old daughter of a Swedish teacher of stage dancing, held him in bondage against his will. His love had turned into a disease, which had reached an acute stage, probably because the gloomy events of so recent occurrence had induced in him a state in which men are peculiarly susceptible to love's poison. It was a friend of his, a physician, who had introduced him in Berlin to the girl and her father, and who later, when sufficiently acquainted with Frederick's secret, raging love, had to take it upon himself to inform the enamoured man of every change in the couple's address.