_Cauterization._--This is a mode of treatment which we have never had occasion to submit to trial, having always given the preference to the process we have just referred to. It is recommended, however, by European authorities. Some of these advocate the “melting” process, or the introduction of sharp points deeply into the thickest parts of the enlargement, while others advise a removal of a portion of the growth and deep cauterization afterwards. If cauterization can be advantageously employed, the best method, in our judgment, would be the process of amputation with Paccalin, or with the galvanic cautery. We may here, while referring to the application of electricity in this connection, appropriately refer to our own experience of a number of years ago, in treating an animal suffering with intra-scrotal champignon, by electrolysis, and succeeding after two applications, in obtaining the complete removal of the tumor. This method, however, consumes too much time to justify its employment in general practice. FISTULA OF THE SCROTUM. Being already aware of several causes of this complication of the operation of castration, we may readily appreciate the treatment they require. It must be remembered that in a majority of cases, the cause of this lesion is the presence of a foreign body in the wound, and that until it is removed, it is in vain to look for a cure. Prof. Bouley has reported a case in which the fistula was due to the presence of a pair of clamps over which the skin had almost entirely cicatrized. INGUINAL HERNIA; HERNIA OF CASTRATION. By this is understood the protrusion of some portion of the contents of the abdominal cavity through the inguinal ring, either a portion of the omentum or of some part of the small intestines, creating either an epiplocele or an enterocele. This complication may take place either during the operation, or shortly afterwards, or at the period of the removal of the clamps. It proceeds from the violent struggling of the animal during the operation; to the colics which are so apt to supervene; to his position when placed in a stall of which the floor is too much inclined; or it may result from some of the various modes of castration, as, for example, the uncovered operation.