in matters of literature, a conversation between two or more persons, either by writing or by word of mouth.

Dialogue appears to be the most ancient form of writing, and is greatly recommended by several authors. The archbishop of Cambrey, at the head of his pastoral instruction, gives an account of the advantages of dialogue.

**DIALTHÆA**, in pharmacy, an unguent much used as a solvent, so called from althea, or marsh-mallows, which is the principal ingredient in it. See **ALTHÆA**.