The Operation must be begun with Incision, which is usually made in form of a Cross, if the Wound be remote from the Sutures, and there are no Muscles to be cut, and in the shape of the Letter T. or of the Figure 7. if it be near the Sutures, so that the Foot of the 7. or of the T. ought to be parallel to the Suture, the top of the Letter descending toward the Temples; it is also made in the middle of the Forehead. If it be sufficient to make a longitudinal Incision in the Forehead; its Wrinkles may be follow'd, and there will be less Deformity in the Scar; but it is never done Crosswise in this Part, and the Lips of the Wound are not to be cut. If an Incision be made on the Muscle _Crotaphites_, and on those of the back-part of the Head, it may be done in form of the Letter V. the Point of which will stand at the bottom of the Muscles; nevertheless it is more convenient to make a longitudinal Incision, by which means fewer Fibres will be cut; and it is always requisite to begin at the lower part, to avoid being hindred by the Hæmorrhage. {211} The Incisions are to be made with the Incision-Knife, and that too boldly when there are no Sinkings; but if there be any, too much weight must not be laid upon 'em: Thus the Incision being finish'd, the Lips of the Skull are to be separated either with the Fingers, or some convenient Instrument; Then if there be no urgent Occasion to apply the Trepan, it may be deferr'd till the next Day, the Wound being dress'd in the mean time with Plaisters, Bolsters, Pledgets, and a large Kerchief or upper Dressing, the use of which we shall shew hereafter.