Dr. Vivodtsef of St. Petersburg, employs a mixture of carbolic acid and alcohol. Taking alcohol of about ninety degrees, he adds one-fifth its weight of carbolic acid; there being required of this mixture, a quantity equal to about one-half the weight of the body to be injected. It may be thrown into the vessels in the same manner as the solution of the chloride of zinc. The high price of alcohol in this country, would constitute an objection to the use of this substance, even if it afford advantages over the zinc, which it probably does not. _Instruments Required._ For the satisfactory performance of this operation, there will be required the _anatomical syringe_. This instrument consists of a brass cylinder and piston, of a capacity of twelve to sixteen ounces, with a movable stop-cock, and series of graduated pipes for arteries of different size. Each pipe has a small rim or shoulder at the point to be introduced into the vessel, above which the ligature is applied, which thus holds the pipe more securely in its position. The absence of the anatomical syringe should not, however, deter the physician from attempting this operation, as, by a little preparation, the common gum-elastic family syringe, of the Mattson or a similar pattern, may be made to answer the purpose. The point of the small or child’s rectum pipe may be reduced with a file, and a shoulder prepared, about one-fourth of an inch from the end, for securely holding it when tied in the vessel. An apparatus of a complicated character, and working by atmospheric pressure, has been devised for this purpose; but while it possesses very few advantages over the syringe described, it is expensive and not easily managed. _The Operation._ In the dissecting-room, it is usual to open the chest and inject through the arch of the aorta; but in other cases, one of the common carotids, and better the right, may be selected. Extend the head, placing thus the muscles upon the stretch, and along the inner border of the right sterno-cleido-mastoid muscle, make an incision two inches in length, through which may be exposed the upper portion of the common carotid artery. After detaching the vessel from the surrounding structures, it should be raised upon the handle of a scalpel and two ligatures passed around, one of which is to be tightly tied, high up, upon the vessel. Below this, a longitudinal slit, one-half inch in length, should be made in the vessel, for receiving the pipe of the syringe, which, when in position, should be securely tied with the second ligature, just above the rim. The stop-cock joint may now be fitted to the pipe. To permit of the escape of as much of the blood as possible, an opening may be made into the jugular vein, ligatures being passed beneath the vessel—one above and one below the opening—that it may be closed at the proper time.