Mr. Challoner had been honest in his statement regarding the departure of Sweetwater. He had not only paid and dismissed our young detective, but he had seen him take the train for New York. And Sweetwater had gone away in good faith, too, possibly with his convictions undisturbed, but acknowledging at last that he had reached the end of his resources. But the brain does not loose its hold upon its work as readily as the hand does. He was halfway to New York and had consciously bidden farewell to the whole subject, when he suddenly startled those about him by rising impetuously to his feet. He sat again immediately, but with a light in his small grey eye which Mr. Gryce would have understood and revelled in. The idea for which he had searched industriously for months had come at last, unbidden; thrown up from some remote recess of the mind which had seemingly closed upon the subject forever.
"I have it. I have it," he murmured in ceaseless reiteration to himself. "I will go back to Mr. Challoner and let him decide if the idea is worth pursuing. Perhaps an experiment may be necessary. It was bitter cold that night; I wish it were icy weather now. But a chemist can help us out. Good God! if this should be the explanation of the mystery, alas for Orlando and alas for Oswald!"
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