Botanical name: 
Mentha x piperita

Format explanation.
Related entry: Menthol

Menthol 20.00 | 4 ounces
Chloroform 25.00 | 5 fl. ounces
Olive Oil to 100.00 | to 20 fl. ounces

Dissolve the menthol in the chloroform, and add the olive oil.

The British Pharmaceutical Codex, 1911, was published by direction of the Council of the Pharmaceutical Society of Great Britain.