This section is from the book "A Treatise On Beverages or The Complete Practical Bottler", by Charles Herman Sulz. Also available from Amazon: A Treatise On Beverages.
This is prepared from the leaves and tops of horehound, a herb found in Asia and on the Mediterranean; naturalized in the United States and Canada, it flowers frequently in our gardens. Horehound has a strong, peculiar, and aromatic odor and an aromatic and persistent bitter taste. It is considered a stomachic tonic and contains a small quantity of volatile oil, and other common principles.