N. B.--Extra leathers for the plunger can be obtained of the proprietor, or his agents, and sent to any place by mail. _Price 12½ cents._
These consist of small mineral balls, and are operated in an improved chamber or cavity, which allows them to always work well, and are not liable to stick or become wedged, as has been the case with instruments formerly made with this kind of a valve. They are greatly superior to India-rubber valves, which soon, by the action of the fluid, become unfit for use. Should the valves by any means be lost, a common marble, if round, will answer the purpose. ☞ After the instrument has been used for administering any thick injection, it should be thoroughly cleansed by pumping some clear water through it, and all sediment which may remain in the valve chambers, A and E, should be removed, or it may cause an obstruction to the working of the valves.
N. B.--_Be careful not to put the instrument away wet, or it will injure the box._
The reader will observe that the couplings to which the flexible tube is attached are made with a neck, which is inserted into the orifice of the tube, the compression of which, when on, holds it firmly in its place. ☞ If at any time the flexible tube should be injured so as to be unfit for use, a new one can be forwarded by mail to any place, on application to either of the proprietor's agents, and it can be readily attached without the least trouble by any person. _Price of Flexible Tube, 25 cents._
Persons may sometimes withdraw the piston or plunger from the barrel, and on account of its peculiar construction be unable to return it again. Therefore, please observe that it is composed of two round pieces of leather, which are turned in opposite directions over the metallic plates--_the upper one turning up, the lower one turning down_. With the leathers thus arranged, it is to be introduced sideways into the barrel, and the portion of the lower leather which remains outside of the barrel gradually and carefully pressed in with the thumb nail. ☞ But in so doing be very careful not to cut or injure the leather. N. B.--Silver Plated Syringes, suitable for using nitrate of silver, furnished to order at short notice. (See _Nitrate of Silver Injections_.)