If it is found that the skin over the defect is inflexible and bound down, it will be found advisable to sever or dissect subcutaneously the adhesions that bind it down with the use of a fine tenotome or a spear-headed paracentesis knife. This may be done two or three days before the parts are injected to assure the surgeon of an absolute cleanliness of the wound. Mayo advocates the injection of a saline solution into subcutaneous wounds thus made as a guide to the extent of dissection and to further loosen the tissues. When the parts, thus loosened, show little tendency to bleed, the author advocates immediate injection, as the waiting for several days permits the throwing out of new connective-tissue cells that interfere to a certain extent with the proper injection of the part. It is with such wounds that secondary elimination is most likely to take place, especially if “Hart paraffin” or paraffin of a high melting point has been employed. This is undoubtedly due to the healing down and contraction of the margins of the wound, which seems to progress more and more, encroaching eventually upon the hard mass and ending in inflammation of the overlying skin and ultimate elimination. With injections of softer consistency this is less frequent and, in fact, may be entirely overcome by limiting the amount of the injection at the first sitting, relying upon a full correction for later operations, when the periphery of the wound has become more or less influenced by the presence of the neutral mass between the wounded surfaces. The subcutaneous dissection referred to must, of course, be done under local anesthesia, preferably the Schleich mixture or a one-per-cent solution of Eucain β. The injection of the paraffin, or hydrocarbon mixture, in semisolid form, having been made and properly molded into shape, is set or fixed by spraying the part with ether or by the application of sterile ice cloths. When liquid paraffin has been injected it will be noted that the paraffin in setting contracts upon itself considerably, leaving less of a correction than anticipated. The needle opening in the skin is next washed off with a twenty-five-per-cent solution of hydrogen peroxid and closed over with a drop of collodion. The patient may then be discharged for the time being, with the instruction to apply ice cloths to the part for at least twelve hours to reduce, as far as possible, the reactive resultant inflammation. On the third day the collodion patch may be removed and replaced with isinglass adhesive plaster applied with an antiseptic solution. The latter is allowed to remain on the skin until it falls off. SPECIFIC CLASSIFICATION FOR THE EMPLOYMENT AND INDICATION OF HYDROCARBON PROTHESES ABOUT THE FACE