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Experiment 1 – To determine the limits of projection of B. prodigiosus from the mouth by ordinary speech, loud speech, and coughing. – The observer first thoroughly rinsed his mouth and gargled his throat with a suspension of B. prodigiosus in 0.85 per cent. sodium chlorid[e?] solution, the viability of which was proved by subcultures at suitable intervals. The observer then entered the room and seated himself in the chair, facing down the length of the table. In line with the observer's mouth, agar plates were exposed from 1 to 6 feet distant, except in some of the coughing experiments, when plates were exposed up to a distance of 10 feet.

The observer then proceeded: (1) to talk in an ordinary conversational tone for five minutes; or (2) talk in a loud tone for five minutes; or (3) cough as much as he could for five minutes.

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