It may, however, be well to describe a few instruments which have been found useful in the large group of cases where cauterization is the principal treatment indicated. Foremost among these is the instrument shown in Fig. 22, which combines advantageously the essential features of the galvano-cautery and the wire snare. [Illustration: FIG. 22. The Galvano-cautery Snare described in the text: 1, the cable of the battery; 2, the canula (which is not shown in full length); 3, the platinum wire; 4, the vulcanite carriage, with screws holding the ends of the platinum wire in metallic contact with the hinge-connections, by which the current is transmitted from the battery; 5, a slotted barrel of aluminium; 6, a movable nut on the screw; 7, a small portion of the screw disengaged from the slotted barrel; 8, milled stationary screw-head.] [Illustration: FIG. 23. The Double Battery employed by the Author: The two sets of plates are seen united by a flat band of metal. The case which encloses the two separate batteries opens in front, displaying the cells, the plates (which are seen pendent over the cells), and the treadle. Above the figure of the battery lies a figure of the Flemming electrode handle and the electrode in position.] It is well known that a loop of wire which is steadily narrowed has great power in severing the attachment of tumors and other outgrowths. When of a large size, it may be sufficiently powerful to pass through bony structures, as well as the softer parts of the body. The principle of the snare has been employed both in the throat, the ear, and the nose; but when my attention was first directed to this subject the forms available were too large and heavy for the delicacy of manipulation demanded in removing small tumors lodged in the narrower recesses of the nose. Moreover, no snare that I could then find would permit the galvanic current to pass through the loop at the time it was being narrowed. I was led, therefore, to inquire into the practicability of an instrument which would at once be light, be of small size, and yet be sufficiently powerful to remove that class of hypertrophied tissues and polypoid growths which are of such frequent occurrence in the nasal chambers. The instrument shown in Fig. 22 combines these qualifications, and satisfactorily performs the service for which it was designed. The only feature of an essential character which may be said to be novel is the fact that the platinum wire (3, Fig. 22) forming the snare is covered with a uniform coat of copper, excepting alone the portion forming the loop, which is bare. As a consequence of this arrangement the current of electricity from the battery is conducted through a double canula (2, Fig. 22) by means of the copper. The length of the instrument being about 9½ inches, and its weight less than ½ ounce, delicacy of manipulation is not interfered with. Besides possessing all the features of the cold wire snare, it