Doctors have found that the expulsive vomiting provoked by doses of the _Sedum acre_ (Betony stone-crop), will serve in diphtheria to remove such false membrane clinging in patches to the throat and tonsils, [277] as threatens suffocation: and after this release afforded by copious vomiting, the diphtheritic foci are prevented from forming again. The _Sedum Acre_ (or Biting Stone-crop) is also named Pepper crop, being a cyme, or head of flowers, which furnishes a pungent taste like that of pepper. This further bears the names of Ginger (in Norfolk), Jack of the Buttery, Gold Dust, Creeping Tom, Wall Pepper, Pricket or Prick Madam, Gold Chain, and Biting Mouse Tail. It was formerly said "the savages of Caledonia use this plant for removing the sloughs of cancer." The herb serves admirably to make a gargle for scurvy of the gums, and a lotion for scrofulous, or syphilitic ulcers. The leaves are thick and very acrid, being crowded together. This and the _Sedums album_ and _reflexum_ were ingredients in a famous worm-expelling medicine, or _theriac_ (treacle), which conferred the title "Jack of the Buttery," as a corruption of "_Bot. theriaque_." The several Stone-crops are so named from _crop_, a top, or bunch of flowers, these plants being found chiefly in tufts upon walls or roofs. From their close growth originally on their native rocks they have acquired the generic title of _Sedum_, from _sedere_ (to sit). HYSSOP. The cultivated Hyssop, now of frequent occurrence in the herb-bed, and a favourite plant there because of its fragrance, belongs to the labiate order, and possesses cordial qualities which give it rank as a Simple. It has pleasantly odorous striped leaves which vary in colour, and possess a camphoraceous odour, with a warm aromatic bitter taste. This is of comparatively recent introduction into our gardens, not having been [278] cultivated until Gerard's time, about 1568, and not being a native English herb. The _Ussopos_ of Dioscorides, was named from _azob_, a holy herb, because used for cleansing sacred places. Hence it is alluded to in this sense scripturally: "Purge me with Hyssop, and I shall be clean: wash me, and I shall be whiter than snow" (Psalm li. 7). Solomon wrote "of all trees, from the Cedar in Lebanon to the Hyssop that springeth out of the wall." The healing virtues of the plant are due to a particular volatile oil which admirably promotes expectoration in bronchial catarrh and asthma. Hyssop tea is a grateful drink well adapted to improve the tone of a feeble stomach, being brewed with the green tops of the herb. The same parts of the plant are sometimes boiled in soup to be given for asthma. The leaves and flowers are of a warm pungent taste, and of an agreeable aromatic smell; therefore if the tops and blossoms are reduced to a powder and added to cold salad herbs they give a comforting cordial virtue.