The application of _torsion_--or the twisting of the arteries by a pair of forceps which will firmly grasp them--has, in a great degree, superseded every other mode of castration, both in the larger and the smaller domesticated animals. The spermatic artery is exposed, and seized with the forceps, which are then closed by a very simple mechanical contrivance; the vessel is drawn a little out from its surrounding tissue, the forceps are turned around seven or eight times, and the vessel liberated. It will be found to be perfectly closed; a small knot will have formed on its extremity; it will retract into the surrounding surface, and not a drop more of blood will flow from it; the cord may then be divided, and the bleeding from any little vessel arrested in the same way. Neither the application of the hot iron, nor of the wooden clamps, whether with or without caustic, can be necessary in the castration of the calf. A new instrument was introduced in France, some few years since, for this purpose, called the _acraseur_,--so constructed as to throw a chain over the cord, which is wound up by means of a screw working upon the chain, and at the same time the cord is twisted off. No bleeding follows this method of operating. This instrument is constructed upon the same principle as the _acraseur_ for use in the human family, for the removal of hemorrhoids, etc., the dimensions of the two only varying. The advantages resulting from the use of this instrument over all other methods are, that the parts generally heal within a week,--the operation is not so painful to the animal,--it is less troublesome to the operator,--also to the owner of the animal,--and lastly, it is a safer and more scientific operation. Its success in France soon gave it a reputation in England, and recently it has been introduced by the author into this country, and with the best results. Contractors, hearing of the success attending this new mode of operating, have visited him from all parts of the country to witness its performance, and not one has returned without leaving an order for this instrument,--so well convinced have they been of its decided superiority over all other methods. TRACHEOTOMY. In consequence of the formation of tumors about the throat in cattle, from inflammation of the parotid gland, blain, etc., so characteristic of this species of animals, it sometimes becomes necessary to perform this operation in order to save their lives. It never fails to give instant relief.