_Treatment._ The horse having been cast with the diseased side uppermost and the head turned to the light, the tumor is seized with the fingers, the forceps, or hook, and drawn gently outward. The chain of the _ecraseur_ may be passed over it and slowly tightened upon the pedicle until it is cut through. This will usually obviate any laceration of the turbinated bones and consequent bleeding. In case of serious hæmorrhage check by cold water, ice, the actual cautery, or by plugging. Polypi with a broad base may be removed with a prob-pointed knife, curved on the flat, and furnished with a long handle. The mass is seized with a vulsella and detachment made by passing the knife with the concave side toward the tumor. In cases where the tumor cannot be seen or reached some have resorted to slitting up the outer wall of the nostril as far as the angle of union of the nasal and maxillary bones, care being taken to make the incision outside the upper end of the cartilage of the ala nasi. If too high to be satisfactorily reached in this way the nasal or frontal bone may be trephined over the body of the tumor as indicated by the flatness on percussion, and the operation performed through the opening thus made. II. =Actinomycosis.= Though much more common in cattle than horses, yet the occasional occurrence of this in the face of the solipede must not pass unnoticed. III. =Sarcoma= and =Carcinoma.= These are found growing from the periosteum, or even starting in the cancellated tissue and projecting into the nose, where they give rise to symptoms like those of fibrous polypi. Being much softer in texture and more liable to ulceration and degeneration they are likely to cause a much more offensive discharge. There is also more tendency to the implication of the submaxillary lymphatic glands. The only treatment is surgical and recurrence is always to be feared. (See Diseases of the Orbit.) IV. =Fatty Tumors= of the nose are described by Röll and Gurlt as existing on the septum and in the sinuses. Being simple, they can be removed with great confidence as to nonrecurrence. V. =Osseous Tumors of the Nasal walls.= These are described by Röll as osteophytes in the maxillary sinus in chronic catarrh, and by Gamgee as osteomata attached to the outer wall of the nasal chamber, which had to be detached by saw and bone forceps. I have found these latter of a soft porous structure easily detached by the knife, and in other cases dense and requiring, chisel, saw and forceps. In one instance the tumor grew from a dense hypertrophy of the maxillary bone which could not be entirely removed because the molar alveoli were implicated. VI. =Cysts= named by Röll and others as present in the mucosa of the ethmoid cells in solipedes often contain larva of the strongylus armatus.