title: "Doctrine of Signatures" challenge.
authors.affiliation: Biology Department, College of St. Benedict, St. Joseph, MN 56374, USA. ssaupe@csbsju.edu
authors.forename: Stephen G
authors.initials: SG
authors.lastname: Saupe
authors.forename: Katherine E
authors.initials: KE
authors.lastname: Sharpless
mesh_terms: D000818:Animals; D010944:Plants / Q000737:chemistry* / Q000145:classification