We have seen a case produced by a tumour, which occupied the posterior portion of the orbit, and caused the organ to be somewhat protruded from its proper position, giving the eye the appearance of hydrophthalmia, for which it was taken, the existence of the tumour never for a moment being suspected. In this case there was partial amaurosis in both sides, although nothing of disease could be discovered in the left eye. Amaurosis is a very deceptive disease, the nerves alone being affected; the humours and coverings of the eye remaining perfectly transparent and natural, imposes upon the inexperienced observer, but is easily detected by those who have witnessed the disease in others. There is a singular watery appearance and vacant stare about the eye of the dog that cannot be mistaken. This peculiarity is owing, no doubt, to the enlargement of the pupil, as before observed. 'Treatment'.--When proceeding from blows, convulsions, or inflammation of the nerve itself, bleeding will be serviceable, as also purging and blistering. If the disease should appear without any symptom, or other cause, to lead us to believe that there is any local affection, the antiphlogistic course should be laid aside, and resort be had to local and constitutional tonic applications, and revulsive frictions to the nape of the neck and spine. A seton may also be applied; and electricity has been recommended in such cases, no doubt arising from want of tone in the general system. This affection, in spite of every effort, is very unmanageable, and but seldom yields to any course of treatment. Strychnia has been used lately, both internally and externally, in the cure of this complaint; it may be sprinkled over a blistered surface immediately above the eye, in the proportion of a grain morning and evening; it may also be administered inwardly at the same time, in doses from the half a grain to a grain twice a day. EXTIRPATION OF THE EYE. It sometimes becomes necessary, from the diseased state of this organ, that it should be taken completely from its socket. This operation, though frightful, perhaps, to consider, is very simple in its application, and may be performed without difficulty by any one accustomed to the use of the knife. The animal is to be held firmly, as before directed, and an assistant to keep the lids widely extended. If the lids cannot be drawn well over the eye, owing to enlargement of the ball caused by disease, they may be separated by an incision at the external angle. A curved needle armed with a thread is now to be passed entirely through the eye, being careful to include sufficient of the sound parts within its grasp to prevent its tearing out. This finished, the needle may be detached, and the ends of the thread being united, the movements of the eye can be governed by means of this ligature: then proceed as follows: