The deep-seated injection of carbolic acid has been proposed and successfully practiced for the relief of various morbid states. For this purpose a two- to five-per-cent solution is most suitable. A solution stronger than this may excite inflammation in the part and coagulate the blood. It is directed by Hüter that the needle of the hypodermatic syringe be first inserted into the inflamed part, and, if no blood flows out through the needle, it will be known that a vein has not been penetrated. From twenty to thirty minims of the solution are then injected. The injections are made once or twice a day in acute diseases, and on alternate days, or less frequently, in chronic cases. Very remarkable results have been obtained from these injections in erysipelas (Hüter, Auf-recht) and in pleuro-pneumonia (Kunze).

Dr. Tessier, of the Mauritius, reports that intermittents are rapidly cured by the injection of three quarters of a grain of carbolic acid dissolved in twenty minims of water.

The parenchymatous injection of carbolic acid is more especially adapted to the treatment of certain surgical maladies. Hüter has employed this method successfully in lupus, chancroid, secondary syphilitic abscesses, ulcerations, synovitis (injected into the affected joint), fistulae, enlarged bursal, hydrocele, etc. Levis, of Philadelphia, cures hydrocele by injecting liquid carbolic acid into the sac after drawing off the fluid. He first inserts the needle of the syringe so that it may be certain the point rests in the cavity. Then the fluid is drawn off, and finally the acid, a drachm or two, is injected through the needle.