Abstract
An apparatus which prevents the distribution of infective droplets into the air of the laboratory during the intranasal inoculation of mice is described.Experiments using Chr. prodigiosum as indicator organism are described to show the extent and duration of the droplet dissemination by inoculated mice, and the effect of the apparatus in reducing this dissemination.We wish to express our thanks to Dr R. B. Bourdillon for many suggestions in the design of the apparatus, and to Mr C. D. Sutton for the photographs.

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