For five years, Dr. B. Smith Hopkins, professor of inorganic chemistry at the University of Illinois, had been searching through a gathering of old friends and nodding acquaintances to discover one of five strangers that reason told him must be present. It was a rather large gathering, 92 individuals by hypothetical count. He had them all assembled in the university's rare earths laboratory, and his procedure was to isolate them one by one, scrutinize them closely, and put them to one side positively identified as Oxygen, Gold, Barium, Chlorine, etc., etc.-old friends-or as...
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