In some cases of gutter fracture the wounds of entry were large and irregular, as a result of upward splintering of the bone at the distal margin of the aperture of entry in the skull, and consequent laceration of the scalp. Again, on the forehead very pure types of slit exit wound were often met with in the position of the vertical or horizontal creases. With higher degrees of velocity on the part of the bullet and consequent comminution at the aperture of exit in the bone, the scalp was more extensively lacerated, and large irregular openings in the soft parts, often occupied by fragments of bone and brain pulp, were met with. It is well to repeat here, however, that the presence of brain pulp in a wound by no means necessarily indicated the aperture of exit, for it was sometimes found in the entry opening also. In the most severe cases, such as are included in class I., the exit wound often possessed in the highest degree the so-called 'explosive' character. From an opening in the skin with everted margins two or more inches in diameter a mass of brain debris, bone fragments and particles of dura-mater, skin, and hair, bound together by coagulated blood, protruded as a primary hernia cerebri if the patient survived the first few hours after the injury. In other cases of the same class the actual opening was smaller, but the whole scalp was swollen and oedematous, sometimes crackling when touched from the presence of extravasated blood in the cellular tissue, while firm palpation often gave the impression that the head consisted of a bag of bones over a considerable area. Gutter fractures of the scalp were sometimes situated beneath an open furrow, gaping from loss of substance, or beneath a bridge of skin; in the latter case they were usually palpable. Simple punctures were also usually palpable, but the smallness of the openings sometimes rendered their detection more difficult than might be assumed. I never saw a case in which the skull escaped injury when the bullet struck the scalp at right angles, but the frequency with which Mauser bullets were found within the helmets of men would suggest that this must have sometimes occurred. A case of injury to the external table alone has been described (p. 243). An illustration of the next degree of injury is afforded by the following:--A bullet lodged in the centre of the forehead, the point lying within the cranial cavity, while the base projected from the surface: this patient suffered but slight immediate trouble, so little, indeed, that he merely asked his officer to remove the bullet for him, as it was inconvenient. The bullet was subsequently removed in the Field hospital.