In the correction of this common deformity the operator is tempted to overdo the fault by hyperinjection. A single furrow is readily corrected by a few drops of the injection, which should be neatly smoothed out. A little of the mass at this part of the face seems to accomplish considerable; in fact, the part seems overcorrected for some time after a judicious and carefully done operation, which is undoubtedly due to the active reaction that follows such cosmetic procedure, owing to the close proximity of the frontal veins and those of the venous arch at the root of the nose, which undergo more or less phlebitis of a mild type, the resultant edema depending upon the pressure caused by the mass on these vessels. The intimate relation and anastomoses of the latter is clearly shown in the carefully prepared dissection represented in the [frontispiece].

In injecting, the needle should be introduced at a point directly at the root of the furrow or furrows—that is, at the junction of the forehead with the nose.

A needle one inch long should be used, taking care not to puncture any of the veins which are found to be very differently placed in various patients. If blood flows from the needle puncture, no injection should be made at that point, but another be chosen which does not give such result, preferably at a later sitting.

The needle should be introduced well upward under the skin so that its point corresponds to the point of greatest depression.

The injection should be made slowly and continued until a tumor, judged to be sufficient to overcome the major deformity when molded out has been formed.

This knowledge can only be gained by experience, and the operator must be cautioned to underinject rather than cause undue prominence of that part of the face.

If, however, his judgment has not been accurate enough, the operator can immediately thereafter squeeze out enough of the filling to give him the desired correction.

If more than a single furrow is to be corrected, he may inject the two center ones, leaving the outer for later operation.

In multiple furrows the injections must be made in conelike form, to give a normal contour to the forehead. The apex of such cone corresponding to a point at the root of the nose, and the base to an arc with its greatest convexity near the median hair line of the scalp, depending upon the length of the furrows.