Leeches were kept in a glass container of water covered with gauze or muslin and placed in a cool, dark room. The water had to be changed frequently, as much as every other day in summer. Pebbles or moss were placed in the bottom of the vessel to aid the leech in removing the slimy epidermis that it shed every four or five days. In the nineteenth century leeches were often sold in drug stores from large, elegant containers with perforated caps. Actually, only the day's supply of the pharmacist's leeches was kept in the attractive storefront jars; the rest were kept out of sight. While most leech jars were simple white crockery pieces with "leeches" lettered in black on the front, some leech jars were over two feet tall and decorated with elegant floral and scroll work. Among the most ornate leech jars were those made in Staffordshire, England.[184] (Figure 20.) _Artificial Leeches_ One of the characteristics of nineteenth-century technology was the attempt to replace natural materials and processes by imitations and mechanisms. Considering the properties of the natural leech, it is no wonder that very early in the nineteenth century inventors began to seek a mechanical substitute. The disadvantages of the leech were many. Wrote one inventor of an artificial leech: In the first place the appearance of the animal is repulsive and disgusting, and delicate and sensitive persons find it difficult to overcome their repugnance to contact with the cold and slimy reptile. This is especially the case when it is a question of their application about or within the mouth. Then again, their disposition to crawl into cavities or passages results sometimes in very annoying accidents. Another source of annoyance is that they are often unwilling to bite--the patience of all concerned being exhausted in fruitless efforts to induce them to take hold. The expense, too, of a considerable number is by no means trifling.[185] [Illustration: FIGURE 20.--Staffordshire leech jars, 19th century. (NMHT 263554 [M-11504]; SI photo 73-4231.)] In addition, leeches were often difficult to obtain, and the rural physician could not easily carry them about. Leech bites could have unfortunate consequences, for many times the bleeding could not be stopped. For these and other reasons, several inventors in Europe and America sought to create a mechanical or artificial leech.[186] Such artificial leeches are often difficult to distinguish from cupping devices, because both sorts of instruments employed some form of scarification and suction. Artificial leeches however, were usually adaptable to small areas of the anatomy, and the puncture wound generally attempted to imitate a leech bite.