Liquid preparations intended to act upon the mucous membrane of the throat by contact are commonly spoken of as gargles, although it is not supposed by anyone that horses can perforin the act known to human patients as gargling. Advantage, however, is taken of the horse's reluctance to swallow, and small quantities of the medicine are poured into the back of his mouth, and when it has been retained there for a short period the head is lowered and the fluid allowed to escape. It may be remarked that gargles are seldom composed of any ingredients that would be hurtful if carried into the stomach.

Applications intended to produce their effect upon any part of the mouth are frequently described as mouth-washes, and the directions generally require the affected parts to be dressed with a soft sponge. If the back of the mouth has to be so treated, the sponge may be attached to a flexible cane.