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Consists of a semi-cylindrical wooden staff, four inches long, without including the handle, and furnished with a wide groove. This is introduced into the rectum, to prevent the point of the bistoury from injuring the intestine, when the internal orifice of the fistula is deeply situate, and it is desirable to perform the operation by incision. This instrument, invented by Marchettis, has been modified by Percy, Runge, &c. Desault invented an instrument for conducting the wire by the anus, in the operation for fistula by ligature. He called it Gorgeret a repoussoir.