_Olfactory._--I observed temporary loss of smell on three occasions. In two instances this accompanied transverse wounds of the bones of the face in which the upper third of the nasal cavities was crossed; in the third a track passing obliquely downwards from the frontal region passed through the inner wall of the orbit, and crossed the nose at a lower level. In view of the small area of the olfactory distribution which was directly implicated, I was at first inclined to regard the loss of smell as dependent on the presence of dried blood on the surface of the mucous membrane, or on obstruction of the cavities from the same cause. Further observation, however, appeared to show that it was due to concussion of the branches of the olfactory nerve, since the loss of function persisted when the cavities were manifestly clear. In all these cases we were confronted with the same difficulty which was experienced both in lesions of sight and hearing, the determination as to whether the concussion was of the branches or of the olfactory bulb. When the symptom was the accompaniment of a fracture of the roof of the orbit, the possibility of concussion of the olfactory lobe was manifest. In all, again, it was difficult to say what part the accompanying concussion of the branches of the fifth nerve took in the production of the symptom. In all three cases mentioned the return of function was gradual, but apparently fairly complete at the end of three weeks. In one it was noted that at first the patient was conscious of an odour before he was able to discriminate its actual nature; later he could determine the latter readily. _Optic._--Some remarks concerning lesions of the optic nerve have already been made under the heading of wounds of the orbit. Concussion and contusion of the nerve both occurred, but I was unable to differentiate between the effects of these on the nerve itself, apart from the effects on the globe of the eye, which usually accompanied wounds of the orbit. In some cases the nerve was directly divided in orbital wounds, and either pressure on or division of the nerve in the intra-cranial portion of its course, or as it traversed the optic foramen, was not uncommon. _Auditory._--Loss of hearing was also not infrequent; thus it accompanied all three wounds of the mastoid process quoted under the heading of the seventh nerve, also two cases of fracture of the occipital bone near the ear quoted on p. 278. In all these instances it was impossible to attribute the deafness to lesion of the nerve alone, as the causative injury equally affected the internal ear, and in at least two the bullet implicated the tympanum as well in its course. The deafness was absolute in each case, and in none had any improvement occurred at the end of nine months. Deafness was a symptom in a certain number of the more severe cerebral injuries in which the course of the bullet was not so near to the internal ear: probably some of these were central in origin.