Astringent solutions are usually applied to the auditory meatus, by injecting them in a gentle stream by means of a small syringe (Fig. 160).

Fig. 160.   Vulcanite syringe for injecting solutions into the ear.

Fig. 160. - Vulcanite syringe for injecting solutions into the ear.

For the mode of injecting into the middle ear, special treatises on aural surgery must be consulted.