This section is from the book "An Experimental History Of The Materia Medica", by William Lewis.
Pinguicula: Sanicula montana flore calcari donato C. B. Pinguicula five fanicula eboracenfis Gerard. Viola palustris, liparis, cucullata, & dodecatheon plinii quibusdam. Pinguicula vulgaris Linn. Butterwort or Yorkshire sanicle: a small plant, with a few, oblong, obtuse, uncut, pale, glossy, unctuous leaves, lying on the ground; among which rife naked pedicles, bearing, each, a purplish monopetalous flower divided into two lips (of which the upper is cut like a heart, the lower into three sections) with a slender cylindrical spur or tail at bottom: the flower is followed by a roundish capsule full of small seeds. It is perennial, grows wild in elevated marshy grounds, and flowers in the spring.
The remarkable unctuosity of this plant, and of some others of the same genus, seems to entitle them to a further examination than has yet been bestowed upon them (a). It is said, that the unctuous and glutinous juice of the pinguicula is used in some places as a liniment for chaps (b), and as a pomatum for the hair (c): that new milk, poured upon the fresh leaves, on a strainer, and after quick colature, set by for a day or two, becomes thick, tenacious, very agreeable and salubrious, and throws off no whey unless long kept; and that a little of the milk, so thickened, serves for bringing fresh milk to the same state (d): that a syrup made from the juice, and decoctions of the leaves in broth, are used among the common people in Wales as cathartics: and that the herb is hurtful to cattle that feed upon it (e).