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Rh Doctor Adams leaned suddenly back against the vestibule wall, and his face whitened.

"I am quite willing to assist the authorities in every possible way, but I must be assured that the diagnosis which has been made in contradiction to my own is the correct one," he asserted with an assumption of dignity. "Of course, in any event an emetic will do no harm—"

"Everything must be done to relieve her at once, but I desire above all else that no one in the household be allowed to suspect that we have discovered the truth; no one at all. Doctor, not even her aunt or her stepfather; for they might innocently enough mention it in the hearing of the guilty person." Odell spoke rapidly in an undertone. "You will be informed as soon as you enter the house that Miss Chalmers is no better, and you will naturally proceed at once to her bedside. I want you to pretend that you have in no way changed your opinion of yesterday; and whatever measures you take to relieve her suffering must seem to be in the line of treatment you would ordinarily prescribe for the case you believed it to be originally."

"That should not be difficult to arrange," the physician murmured. "Should your suspicions be unfounded after all, Sergeant, the treatment will only cause temporary discomfort to my patient."

Odell could have throttled the pedantic little man for his tenacious obstinacy, but he continued patiently to elucidate his plan.

"After you have concluded your treatment I wish you to make some excuse to remain with your patient for the rest of the day if need be; at any rate until I require your