potent solutions habitually employed at the St. Pancras School, I have spoken; but there is another practice to which I have not alluded: corks are forcibly thrust into the holes made by the trephine, under the notion that by such means the opening can be kept free, and the wound uncorked and corked up like the mouth of a bottle. Mr. Percival has spared me the trouble of exposing the folly of the idea, and the inutility of the practice. That gentleman tried the notable experiment, and found that the cork in no degree delayed the consequence it was employed to retard. The presence of a foreign body thrust into immediate connexion with a diseased surface, and violently there retained, must cause excruciating agony--promote serious irritation--and might lead to the worst possible results. The ignorance should indeed be gross, which could conjecture such a vulgar resort was capable of inducing the slightest benefit. Equally objectionable is the custom recommended by the veterinary professors, of shutting an animal up in a close stable, and causing it to inhale the fumes of chlorine gas. Chlorine is an irritant to mucous membranes. If the nasal cavities were the seat of the disease, the passage of the air being rapid through these channels, and retained for a comparatively long period in the bronchia, the supposed remedy would be far more likely to affect the lungs, than to act immediately on the part which it was intended to benefit. In respiration, however, it is not probable that even during health, any large quantity of air enters the sinuses, which, in these cases, are the seats of the disease; and when those cavities are blocked up by an abnormal secretion, none could possibly gain admittance to them. Chlorine, therefore, obviously is inoperative in the direction where its remedial agency is desired to act; and it does some injury. It violently affects the animal which requires to be soothed; causes it to endure much inconvenience and even suffering; produces quickened respiration with violent cough, and may be reasonably supposed to lay the foundation of subsequent disease. The advantages of its employment have not been demonstrated, but the results of practice rather show it to be injurious. By the members of the veterinary profession it is not generally used: gentler measures are of greater importance, and these ought, only under very peculiar circumstances, to be abandoned. There, however, yet remains to be described, the mode of proceeding when the diseased tooth is seated in the lower jaw. In that case, a sinus or canal, discharging an unhealthy matter, is present. No treatment will cause that sinus to close, while the diseased tooth is retained; and until its removal is effected, all applications designed for that end are thrown away. After the tooth has been extracted, a solution of sulphate of zinc may, with advantage, be daily injected, and constitutional measures at the same time adopted, till an altered action