Descbiption. — The ThorougTmort is an indigenous perennial herb, with a horizontal, crooked root. The sterna are round, stout, hairy, and from one to five feet high. The Itaoea are uppoaite, connale-perfoliate, each pair resembling a single leaf centraZly perforated by the stem, and placed at right angles to it. Plmeers numerous, Jo/is'ie, in dense terminal corymbs. This well-known plant grows in low grounds, on the borders of swamps, wet prairies, flowering in August and Beptetaber. It has a feeble, peculiar odor, and a herbaceous, very bitter taste. Officinai PRBPARATIOMS. — Tiucture of the flowf-rs and iPaves of the plant; dilutions with stong alcohol Ajnaloghjes. — Arnica, Baptisia, Bryonia, Gimicifaga, GMmoniilla, Gel- seminum, Ipeeaeuanha, Mereuriue, Ntix vomica, Podophyllum, Trtosteum.