Abstract
Summary.: A method is described by which simultaneous determination can be made of the rate of ciliary beat and that of the tracheal flow of mucus in small living mammals (rats and guinea pigs). The body temperature and the temperature and humidity of the environmental air can be varied. All influence of foreign substances such as saline solutions is avoided. The various phases of a single ciliary cycle are registered with a special camera. The method also permits study of the acute and chronic effects on the mucosa of different substances. Some experiments with SO2 are briefly reported.

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