As with most cases of traumatic tetanus, this complication is generally fatal, and it is, without doubt, the most dangerous of all and marked by the greatest mortality. It is generally admitted that exposure to cold and dampness is one of the most prolific causes, especially in animals which, having but recently recovered, are too soon put to work. The various modes of operation have also been considered to have some influence upon its development, though there is probably no ground upon which this theory can find a support. Whether the nature of the soil of a district, or its atmospheric condition, may have any connection with it, is also a question. We know that in some portions of Long Island, cases of tetanus are commonly met with, at some seasons of the year, after surgical operations of every kind. It may appear within a few days following the castration, or it may defer its visitation for a period of twenty days, or longer. The treatment adopted for the tetanus of castration is that which is applied to all cases of that traumatic affection. AMAUROSIS. This disease may also be included among those classed as the sequelæ of castration, having been known to follow cases where hemorrhage of the small testicular artery had occurred. Tonic treatment internally and local stimulating applications may sometimes relieve this complication, but it will generally be admitted to be incurable. COMPARATIVE VIEW OF THE VARIOUS MODES OF CASTRATION. The process by _simple excision_, by reason of the hemorrhage which necessarily accompanies it, though not inevitably dangerous, must be excluded from the domain of general practice. That of _scraping the cord_ has not, so far as our knowledge extends, been sufficiently tested, either in European or American practice, to justify its recommendation. The process of _torsion below the epididymis_ is too much subject to the development of champignon, as well as that of _free torsion_ with the hands, to be admitted by judicious operators, while the _limited torsion_ is a method which has taken rank amongst safe operators, notwithstanding the enormous swelling of the parts by which it is commonly accompanied, and the necessity it involves of the introduction of the fingers into the wound to prevent its premature closing. The method by the _ecraseur_, though occupying a longer time in its completion than some others, has secured very favorable results, especially in the hands of American operators.