I had but one opportunity of observing a case in which a retained bullet exercised compression, and none in which this was due to displaced bone fragments. I also only once came across a case of complete section, but no doubt both bone pressure and section may have occurred with greater frequency amongst patients dying on the field or shortly after. The case of section is illustrated in fig. 80. It will be noted that, although the section is complete, the bullet lies to one side of the canal, and hence the bullet, as fixed in its course by the bone of the centrum, directly struck but half of the whole width of the cord. It was striking how little secondary change in the cord had occurred in the neighbourhood of the spot of division. This well illustrates the comparatively slight vibratory effect of a bullet travelling with a degree of velocity insufficient to completely perforate the vertebral column. _Symptoms of injury to the spinal cord._--In _slight spinal concussion_ these exactly resembled those of the more severe lesions, except in their transitory nature. They consisted in loss of cutaneous sensibility, motor paralysis, and vesical and rectal incompetence. The phenomena persisted from periods of a few hours to two or three days, return of function being first noticeable in the sensory nerves, and often with modification in the way of lowered acuteness, or minor signs of irritation, such as formication, slight hyperaesthesia or pain, pointing to a combination with the least extensive degrees of haemorrhage; later, motor power was rapidly regained. The subjects of such symptoms often suffered from weakness and unsteadiness in movement for some days or weeks; a sharp line of discrimination between such cases and those described in the next paragraphs is manifestly impossible. _Spinal haemorrhage._--The symptoms of this condition developed differently according to whether concurrent concussion existed. Occasionally very typical instances of pure haemorrhage were observed with transient symptoms:-- (96) A private in the Yorkshire Light Infantry was wounded at Modder River; the bullet entered between the eleventh and twelfth ribs, just posterior to the left mid-axillary line, emerging in the posterior axillary fold, at its junction with the right side of the trunk. On the second day after the injury the lower extremities became drawn up, the knees and hips assuming a flexed position, and this was followed shortly by the advent of complete motor and sensory paraplegia, accompanied by retention of urine. Two days later, the patient again passed water normally, and gradual and rapid return of both sensation and motor power took place. At the end of fourteen days no trace of the condition remained, and the patient was shortly after sent home.