"The Professor unburied and opened the bottle, turning his head away so as not to be overcome by the odor, while I watched the proceedings by a stop-watch. The boys were all ears—nose, I mean. After fifteen seconds, most of the students in the first row were holding up a hand. In 40 seconds the odor, which did not exist, had traveled to the rear benches, and when we counted noses, seventy-five per cent of the students acknowledged perception of the odor and some even went so far as to be nauseated by it."