nonsense!"

Alfred's eyes showed that her cool, common-sense speech had had its effect. His brotherly panic dissolved in an instant, and instead there came into his face a vague, calculating expression, as if some marvelous possibility had just dawned upon him. As she watched the subtle waves of cunning and appraisal pass fleetingly over his countenance she became less and less certain that her mode of reassurance had been a wise one, and before he spoke she found herself shivering at something she could not define. A keen medical instinct almost told her that his moment of sanity had passed, and that he was now once more the unrestrained fanatic for scientific research. There was something morbid in the quick narrowing of his eyes at her casual mention of good health. What was he thinking? To what unnatural extreme was his passion for experiment about to be pushed? Wherein lay the special significance of her pure blood and absolutely flawless organic state? None of these misgivings, however, troubled Georgina for more than a second, and she was quite natural and unsuspicious as she felt her brother's steady fingers at her pulse."You're a bit feverish, Georgie," he said in a precise, elaborately restrained voice as he looked professionally into her eyes.

"Why, nonsense, I'm all right," she replied. "One would think you were on the watch for fever patients just for the sake of showing off your discovery! It _would_ be poetic, though, if you could make your final proof and demonstration by curing your own sister!"

Clarendon started violently and guiltily. Had she suspected his wish? Had he muttered anything aloud? He looked at her closely, and saw that she had no inkling of the truth. She smiled up sweetly into his face and patted his hand as he stood by the side of the lounge. Then he took a small oblong leather case from his vest pocket, and taking out a little gold syringe, he began fingering it thoughtfully, pushing the piston speculatively in and out of the empty cylinder.

"I wonder," he began with suave sententiousness, "whether you would really be willing to help science in--something like that way--if the need arose? Whether you would have the devotion to offer yourself to the cause of medicine as a sort of Jephthah's daughter if you knew it meant the absolute perfection and completion of my work?"

Georgina, catching the odd and unmistakable glitter in her brother's eyes, knew at last that her worst fears were true. There was nothing to do now but keep him quiet at all hazards and to pray that Margarita had 

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