single case in which the incisors were affected, nor in which the tushes were diseased. I am, however, informed by Mr. Field, whose high reputation and extensive practice give weight to his assertion, that he has had to treat horses for disease of the incisor teeth, and has even been obliged to remove a portion of the lower jaw in order to procure relief. Other practitioners, of whom inquiry has been made, have not known such a form of disease, neither have I witnessed it: instances of this kind, therefore, are rare, and hitherto have not attracted attention. The honour of making known the possibility of their existence, belongs to a gentleman whose name is proudly associated with the science which it has so long adorned. The incisors of the colt are not, however, liable to be seriously affected: when those teeth decay, age must have advanced. During colthood, nevertheless, the teeth, if exempt from disease, may be the causes of great constitutional disturbance. Mr. Percival, the gentleman who, as editor of the "Veterinarian," and author of the best and most elaborate works on the diseases of the horse that have yet appeared in the English language, attaches much importance to those ailments incidental to dentition. Of the consequences that may ensue from the cutting of the tushes, he adduces positive proof, and from his admirable work on "Hippopathology," page 172, vol. 2, I cannot forbear extracting the following most valuable case:-- "I was requested to give my opinion concerning a horse, then in his fifth year, who had fed so sparingly for the last fortnight, and so rapidly declined in condition in consequence, that his owner, a veterinary surgeon, was under no light apprehensions about his life. He had himself examined his mouth, without having discovered any defect or disease; though another veterinary surgeon was of opinion, that the averseness or inability manifested in mastication, and the consequent _cudding_, arose from preternatural _bluntness_ of the surfaces of the molar teeth, which were, in consequence, filed; but without beneficial result. It was after this that I saw the horse; and I confess I was, at my first examination, quite as much at a loss to offer any thing satisfactory as others had been. While meditating, however, after my inspection, on the apparently extraordinary nature of the case, it struck me that I had not seen the tusks. I went back, and discovered two little tumours, red and hard, in the situation of the inferior tusks, which, when pressed, gave the animal insufferable pain. I instantly took a pocket-knife, and made crucial incisions through them, down to the coming teeth, from which moment the horse recovered his appetite, and by degrees his wonted condition."