Description. -- Tansy has a perennial creeping root, and an erect herbaceous stem, one to three feet high. The leaves are smoothish, dark-green; flowers, golden-yellow; fruit, an achenium.
    History. -- Indigenous to Europe, but has been introduced into this country and cultivated by many; but grows also spontaneously in old grounds, along roads, flowering in the latter part of summer. Drying impairs much of the activity of the plant. It contains volatile oil, wax, stearine, chlorophyll, bitter resin, yellow coloring matter, tannin with gallic acid, bitter extractive gum, and tanacetic acid, which is crystallizable and precipitates lime, baryta, and oxide of lead.
    Properties and Uses. -- It is tonic, emmenagogue, and diaphoretic. In small doses, the cold infusion will be found useful in convalescence from exhausting diseases, dyspepsia, hysteria, and jaundice. The warm infusion is diaphoretic and emmenagogue. It bears a good reputation in suppressed menstruation, but should be used only when the suppression is due to morbid causes.