One of the most interesting leech substitutes, sold by George Teimann & Co. as its "Patent Artificial Leech," employed ether in exhausting the glass "leeches." Patented by F. A. Stohlmann and A. H. Smith of New York in 1870, the "leech" consisted of a glass tube, either straight or with a mouth on the side so that the tube would hang somewhat like a living leech. To expel air from the tube, a few drops of ether were placed in it, after which it was immersed to its mouth in hot water until the ether vaporized. The tube was then applied to the skin and allowed to cool, thus sucking blood from a wound made by the scarificator, a long metal tube that was rotated to make a circular incision. One of the patentees explained the advantages of the device: In all previous attempts at an artificial leech the vacuum has been produced by the action of a piston. This renders the instrument too heavy to retain its position, and necessitates its constantly being held. This precludes the application of any number at once, even if the cost of half-a-dozen such instruments were left out of the account. But in the case of this leech, the tubes, being exceedingly light, attach themselves at once, remaining in position until filled; and as the cost of them is but a few cents, there is no limit to the number which may be applied.[191] To take the place of leeches in the uterus, quite a number of uterine scarificators were sold. These were generally simple puncturing instruments without spring mechanisms. If insufficient blood flowed from the scarification, Thomas's Dry Cupper, a widely available vulcanite syringe, could be inserted into the vagina to cup the cervix before puncturing.[192] At least one attempt was made to combine puncture and suction in a device for uterine application. This was Dr. William Reese's "Uterine Leech," introduced in 1876. It consisted of a graduated glass cylinder 190 mm long and 12 mm in diameter containing a piston and a rod with a spear point. The rod was surrounded by a spring that withdrew the blade after it punctured the cervix. Several American companies, including George Tiemann & Co., offered the device for sale.[193] [Illustration: FIGURE 21.--Damoiseau's terabdella. (From Damoiseau, _La Terabdelle ou machine pneumatique_, Paris, 1862. Photo courtesy of NLM.)]