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In one instance conversational speech was maintained for a period of thirty minutes*. At the conclusion of his speaking or coughing, the observer left the room. In order to allow the droplets in the air, if present, to settle on the surface of the plates, the plates remained exposed an additional ten minutes after the period of speaking or coughing. The colonies appearing on the plates were counted and recorded after seventy-two hours' incubation at room temperature.

Agar plates were exposed for one hour in the room between different stages of this experiment. By this means we found that an eight hour interval between periods of talking or coughing was sufficient to ensure the absence of B. prodigiosus in the circulating air.

* Oops. #overlyHonestMethods

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