Hermann Adolph Köhler (1834-1879) was a Prussian physician and chemist. In those days, most medicines were made from natural sources.
His most famous work was the herbal "Köhler's Medicinal Plants" (or, Köhler's Medizinal-Pflanzen). This described plants from all around the world with medicinal uses.
Medizinal-Pflanzen had beautiful lithographs to illustrate the plants. Here are some of the best for you to choose from.
They are genuine antiques from the 1890s.