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There's also phytochemistry and botany, and there are all of these kinds of tangential areas of study that are in the sciences that overlap with herbalism.

Tien-chioh Tso, a slight, bespectacled Chinese man, had immigrated to the U.S. to accept a fellowship at Pennsylvania State University, where he pursued a graduate degree in phytochemistry and agronomy.

Tu's detractors, however, point out that using ether and other low boiling point solvents to extract active ingredients from plants is standard phytochemistry.