All these resemble our garden rhubarb more or less in their general characteristics, and in possessing much tannin. Most of them chemically furnish "rumicin," or crysophanic acid, which is highly useful in several chronic diseases of the skin among scrofulous patients. The generic name of several Docks is _rumex_, from the Hebrew _rumach_, a "spear"; others arc called _lapathum_, from the Greek verb _lapazein_, to cleanse, because they act medicinally as purgatives. The common wayside Dock (_Rumex obtusifolius_) is the most ordinary of all the Docks, being large and spreading, and so coarse that cattle refuse to eat it. The leaves are often applied as a rustic remedy to burns and scalds, and are used for dressing blisters. Likewise a popular cure for nettle stings is to rub them with a Dock leaf, saying at the same time:-- "Out nettle: in Dock; Dock shall have a new smock." [159] or: "Nettle out: Dock in; Dock remove the nettle sting." A tea made from the root was formerly given for the cure of boils, and the plant is frequently called Butterdock, because its leaves are put into use for wrapping up butter. This Dock will not thrive in poor worthless soil; but its broad foliage serves to lodge the destructive turnip fly. The root when dried maybe added to tooth powder. It was under the broad leaf of a roadside Dock that Hop o' My Thumb, famous in nursery lore, sought refuge from a storm, and was unfortunately swallowed whilst still beneath the leaf by a passing hungry cow. The herb Patience, or Monk's Rhubarb (_Rumex alpinus_), a Griselda among herbs, may be given with admirable effect in pottage, as a domestic aperient, "loosening the belly, helping the jaundice, and dispersing the tympany." This grows wild in some parts, by roadsides, and near cottages, but is not common except as a cultivated herb ill the kitchen-garden, known as "Patience-dock." It is a remarkable fact that the toughest flesh-meat, if boiled with the herb, or with other kindred docks, will become quite tender. The name Patience, or Passions, was probably from the Italian _Lapazio_, a corruption of _Lapathum_, which was mistaken for _la passio_, the passion of Christ.