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Method and Technic

B. prodigiosus was selected as a suitable organism to introduce into the mouth for these experiments, because of its innocuous character* and because its pigment formation makes its recognition easy on agar plates.

For our experiments two small rooms were selected which were used for no other purpose during this time. Each of these rooms contained a metal topped table and a chair. The arrangement of furniture is shown in Figure 1. When the observer was seated in the chair, the tabletop was just below his ensiform. Agar plates exposed on the surface of the tables showed no B. prodigiosus circulating in the air and dust.

* I don't think it's considered innocuous today.

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