This section is from the book "An Experimental History Of The Materia Medica", by William Lewis.
Tanacetum Pharm. Lond. and Edinb. Tanacetum vulgare luteum C. B. Tanafia, atha-nafia, & parthenium mas quibusdam. Tanacetum vulgare Linn. Tansy: a plant with large leaves, divided to the rib, on both sides, into oblong deeply indented segments; producing, on the tops of the stalks, several gold-coloured discous flowers, in umbel-like clusters, followed by small oblong blackish feeds. It is perennial, grows wild by road-sides and about the borders of fields, and flowers in June and July.
The leaves and flowers of tansy have a strong, not very disagreeable smell, and a bitter some-what aromatic taste: the flowers are stronger though rather less unpleasant than the leaves. They give out their virtue both to water and spirit, most perfectly to the latter: the tincture, made from the leaves, is of a fine green, from the flowers of a bright pale yellow colour.
Distilled with water, they yield a greenish-yellow essential oil, smelling strongly of the herb: the remaining decoction, infpiffated, affords a strong bitter fubfaline extract. The spirituous tinctures give over also, in infpifTation, a considerable part of their flavour *(a); a part of it remaining, along with the bitter matter, in the extract.
This plant is used as a warm deobstruent bitter, in weakness of the stomach and in cachectic and hysteric disorders; and likewise as an anthelmintic. The feeds have been chiefly recommended in this last intention, and supposed by some to be the santonicum of the shops, from which they differ not a little in quality as well as in appearance, being much less bitter, and of a more aromatic flavour.