The fox-glove is a biennial herb from two to seven feet in height with a solitary, sparingly branched stem. The basal leaves are very large and broad, gradually becoming narrower and smaller toward the apex of the stem and its branches, dark green in color, pubescent, margin dentate, venation very prominent. The inflorescence is very characteristic. The large, numerous flowers are closely crowded and pendulous from one side of the arched stalk. The corolla is purple and spotted on the inside. It is a very handsome plant, widely distributed, preferring a sandy or gravelly soil in open woods. When abundant and in full bloom it makes a beautiful exhibit. It is a garden favorite in many lands. This plant is apparently not mentioned in the works of older authors. It was not known to the ancient Greeks and Romans. It was, however, used medicinally in the northern countries of Europe since very remote times. The Anglo-Saxon word fox-glove is derived from the Welsh (11th century), _foxes-glew_, meaning fox music in allusion to an ancient musical instrument consisting of bells hung on an arched support. In the Scandinavian idioms the plant bears the name of foxes' bells. The German name _Fingerhut_, meaning finger hat, hence thimble, is derived from the resemblance of the flower to a thimble. Still more poetical is the name _Wald-glöcklein_, meaning little forest bells, in reference to the inflorescence. In England the flowers are known as foxes' fingers, ladies' fingers and dead men's bells. According to an old English work on medicine the early physicians of Wales and England applied this drug externally only. It was not until 1775 when the English physician Withering began to use it internally, especially in the treatment of hydrophobia. Modern physicians consider digitalis one of the most important medicinal plants. It is a very powerful, hence very poisonous drug, its action being due to an active principle known as _digitalin_. Its principal use is in the treatment of deficient heart action due to various causes but especially when due to valvular lesions. The physician must, however, observe great care in its administration, not only because of its powerful action but also because of its "cumulative action;" that is, the effect of the drug increases although only normal medicinal doses are given at regular intervals, so that fatal poisoning may result, especially if the patient should attempt to rise suddenly. The physician guards against this by gradually decreasing the dose or by discontinuing it for a time and by requiring the patient to remain in a recumbent position while under the influence of the drug.