Dr. Mercer very properly remarks that, in the second or chondromatous variety of polypus of the meatus, the treatment must depend upon the concomitant circumstances. If the tumour is seated close to the membrana tympani, and has a broad and sessile base, then it cannot be excised or noosed with any degree of success. It must therefore be treated by the daily application of the solid nitrate of silver, applied exactly to its surface; and, in the intervals of application, the use of any collyria may be had recourse to. If the substance of the growth be firm and solid, and possess little sensibility, then a very speedy mode of getting rid of it is to divide its substance with a small knife; and afterwards, by applying the solid nitrate of silver, the tumour will soon be sloughed away. The dog is liable to polypi in the nasal cavity, in the anus, and in the vagina, which it will not be out of place to mention here. The polypi of the nasal and of the anal cavities often show themselves under the form of rounded bodies, projecting from the nose or anus. Their size and consistence are variable--sometimes soft, tearing with the greatest facility, and bleeding at the slightest touch; at other times, solid and covered with pituitary membrane. They are generally the result of ulcerations, wounds, fractures, perforations of the turbinated bones, sinuses,&c. These polypous productions obstruct the passage of the air, and more or less impede the breathing. They are best extirpated by means of a ligature, or circular compression, on the pedicle of the polypus, and tightened every second day. We may discover the presence of a tumour of this nature in one of the nasal passages, when, on putting our hand to the orifice of the nostril, there issues little or no air; or when we sound the nostril with the finger or a probe, or examine it on a bright day. The methods of destroying polypi in the nasal cavity vary with the texture, size, form, and position of these excrescences. Excision with the bistoury, or with scissors, may be tried when the polypus is near the orifice of the nostril, and particularly when it is not large at the base. Excision should be followed by cauterization with the red-hot iron, by which a portion of the base of the tumour is destroyed, and which could not be reached by a sharp instrument. To succeed in these operations, it is frequently necessary to cut through the false nostril. The edges of the wound may afterwards be united by a suture.