Part 23

Such symptoms are often followed by vomiting and rigors, and too frequently by convulsions, more furious delirium, and coma. On examination after death, an increased vascularity of the cerebral membranes is observed; there is an effusion of gelatinous-looking matter on the surface of the membranes, and in the cellular tissue beneath the arachnoid. In more advanced cases, thin patches of lymph, or more extensive strata of it, cover the arachnoid and the inner surface of the dura mater; a puriform fluid is found effused between these membranes, and sometimes blood and matter are deposited in some part of the cerebral substance; bloody serum is effused into the cavities, and at the base of the brain. The above symptoms and appearances sometimes follow injuries not at first thought severe, but are most frequently the result of such as are attended with læsion of the bone, or of the internal parts.

It is not at all improbable that concussion is produced after a manner somewhat resembling the following. The brain has a natural tendency to remain at rest, but is liable to be brought into a state of commotion by impulses on the cranium being communicated to it. When a slight blow is inflicted on the skull, only a slight commotion of the brain is induced, the cranial contents are, as it were, slightly jumbled, and a temporary and trifling confusion of its functions follows. When, however, the stroke is more severe, the brain is separated from its cranial attachments, both at the point struck and at the part directly opposite,—it is thrown upon itself towards its centre; its substance is thereby condensed, its diameter in the direction of the impulse is diminished, and a separation between the brain and cranium is formed at each extremity of that diameter. By post mortem examinations, it has been ascertained that condensation of the substance of the brain does exist in cases of severe concussion. Such commotion may be sufficient to cause instant extinction of life, or the brain may gradually resume its former condition, or with only such slight incited action as may be required to reunite the dura mater with the inner table of the skull. Extravasation of blood or serum is extremely liable to occur in such cases, the vessels being either compressed, stretched, or otherwise thrown out of their natural relations along with the other cranial contents, reparation can only take place by absorption of the extravasated fluid, and gradual deposition of plastic matter. When extravasation takes place to a greater extent, compression is the consequence, as will be more fully explained further on. Perhaps the brain does not recover itself gradually, but suddenly; the impulse, which was at first directed from the circumference towards the centre, now acting from the centre towards the circumference; and then the propulsions and recoilings may be repeated, though gradually lessening in their intensity, until the effect of the original impulse is lost, and all vibration consequently ceases. But concussion may be caused by an impulse received not immediately on the cranium, but on some other part of the body, as when a person falls from a considerable height and alights on the feet or buttocks; and in such a case also its effects may be indirectly communicated to it through the brain, and may produce equally violent effects, without there ever being any appreciable lesion of the cerebral matter.

The circulation may be merely disturbed, or laceration of the brain may occur with extravasation of blood into its substance. It may present the appearance of having been bruised, or the tear of its substance may be extensive. A multitude of minute vessels may be torn without the substance of the brain being much broken, in which case bloody specks will be observed over a large surface of the interior of the organ. In many fatal cases no change in the state, either of the vessels or of the cerebral substance, is perceptible on minute examinations. The organ in these cases has been merely disturbed and shaken, without visible rupture or hurt having occurred. Again, many patients are supposed to labour under concussion only, in whom fracture of the base of the cranium, or extravasation of blood on the surface, or into the substance of the brain, are discovered after death. It is always difficult to distinguish between the effects of mere concussion and those of compression of the brain by extravasated fluid; for, in the greater number of cases, the symptoms of both affections are blended together. In both there is insensibility from the first; but if an interval of sensibility occur, diagnosis is rendered more easy and certain, it being a fact well verified by experience, that the state of stupor which precedes the return of correct intellectual function is the effect of concussion, and that there is every reason to believe that the insensibility into which the patient subsequently sinks, is caused by compression of the brain; if compression existed from the first, the stupor might not be of longer duration than if it were the effect of concussion, but its stillness would not be interrupted by any restoration of mental exercise, however short. Remarkable effects sometimes result from commotion of the brain; the patient may suffer loss of vision or of hearing, either partial or complete; or partial paralysis may occur; of the muscles, for instance, supplied by the portio dura. In many cases such affections may be supposed to arise from compression of nerves, or other læsion subsequent to and caused by the effects of concussion, and probably connected with fracture of the base of the cranium. Again, it occasionally happens that the senses are rendered more acute than previously, and of this I shall mention an example which came under my own observation. An old nurse sustained fracture of the vertex, with slight depression of the broken part, in consequence of some rubbish having fallen on her from a considerable height. Stupor, along with the other symptoms of concussion, was the immediate effect of the injury, but disappeared in two or three days. Her hearing, which previously to the accident had been long so obtuse as to render it necessary for her to discontinue her employment, became so intensely acute, that the most trifling noise became a source of pain. She gave immediate orders for the clock to be stopped, the ticking of which annoyed her greatly. Her hearing gradually became of the natural intensity, and continued perfect. In this case there can be little doubt that restoration of a sense which had long remained dormant arose entirely from cerebral commotion, for no discharge of blood or other fluid occurred from the ears, by which cerumen accumulated in these organs might have been displaced. People sometimes forget languages from hurts of the brain, whilst they retain memory in other respects; or, rather, the memory on certain things becomes injured, but remains quite perfect on others.

Treatment.—Whilst the circulation remains depressed after injuries of the head, or of other parts of the body, it is a common practice to abstract blood; but it is one which cannot be too much reprobated, for it is attended with great risk, and can be productive of no benefit; the feeble remains of vital power, whilst struggling as it were against the depressing cause, may by depletion be quickly annihilated, when the vigour which they still retained might have been sufficient, if encouraged and supported, to overcome those effects of external injury which had so far reduced them.

When a patient is seen insensible, it is highly proper and necessary to examine carefully the trunk, head, and limbs, in order to ascertain whether either fractures or displacements have occurred; for it is by no means creditable to the care or science of a surgeon to be made aware of such accidents when the patient regains his senses, after the lapse perhaps of weeks, and when they can be remedied, if at all, with much difficulty.

In the first stage of concussion, as was already observed, the circulation is much weakened, and it is therefore necessary to adopt means for sustaining and strengthening it; and with this view, warmth is to be applied to the surface, more especially to the extremities and epigastrium.

When the powers of life appear to be failing, stimulants must be administered internally. Perhaps the most convenient stimulus is ardent spirit, the only objection to its use being, that when imprudently given in large quantities, its effects, though at first stimulant, become sedative; it ought to be given in small quantities, and at short intervals. Other stimuli, as preparations of ammonia, may be given by the mouth; and much advantage will often be found to follow the employment of a turpentine enema, free motion of the bowels, as well as excitement of the system, being thereby procured.

Stimuli, however, should always be used with much caution and prudence, and never unless fully warranted by the train of symptoms under which the patient is labouring at the time; when the circulation is restored in the limbs, and is becoming throughout steady and more natural, all sources of excitement must be abandoned and carefully avoided, as there is considerable risk of reaction proceeding to too great a height. The patient is to be kept quiet in a darkened room, cold applications made to the head, previously shaved, and free motion of the bowels procured by neutral salts with antimony, or by other purgatives not of an irritating nature, and not given in such doses as to prove violently cathartic. Enemata are in some cases preferable, and are always a valuable adjunct, to the employment of purgatives by the mouth; they procure evacuation from the larger intestines, in which feculent matter chiefly accumulates; they ought to contain asafœtida and turpentine; with these additions more salutary effects are produced than from mere evacuants. The latter ingredient would seem, by its local stimulus, to impart energy to the bowels sufficient for the correct performances of their functions, while the former tends to allay spasm and irritation, both locally and generally.

If the circulation becomes unduly excited, abstraction of blood from the system, in sufficient quantities and at proper intervals, is absolutely necessary; and the depletion must be regulated by the symptoms and circumstances of each case. The action will in general be more speedily and effectually moderated by one copious bleeding at the commencement, than by repeated bleedings to a less extent. An easy and open state of the bowels is of much importance in the excited stage. Mercurial preparations are sometimes useful, as they are known to possess the power of causing the absorption of coagulated lymph and serum, and probably of preventing their effusion.

In cases where insensibility continues after the arterial excitement has been subdued, counter-irritation on the head or the back of the neck is often useful, as the application of blisters, or the rubbing in of antimonial ointment. These are supposed to act by causing an unusual influx of blood to the surface, producing a change in that fluid by the copious purulent, serous, and lymphatic secretions from the irritated part, and thereby diminishing the distended and engorged state of the internal vessels, which might produce considerable compression of the brain.

If, at a late period in the case, the powers of life begin to flag, stimulants must be again had recourse to, and may now be pushed pretty freely, there being less risk of inordinate action ensuing, and much reason to fear that life can be prolonged only by the continued use of powerful means for the excitement of the system. Nor ought the surgeon to cease stimulating though the vital powers continue to diminish in spite of the treatment, and though the circumstances of the case may be so hopeless as to lead him to suppose that death cannot be further delayed; for many patients, who would otherwise have necessarily perished, have, by the continued use of stimuli, recovered under my care their sensibility, and been ultimately restored to health.

Separation of the dura mater from the cranium, with more or less extravasation of blood between, sometimes takes place as a consequence of blows on the head, even though not severe. The blood may be absorbed, or an unhealthy abscess may form between the bone and membrane, attended with violent, dangerous, and, if neglected, fatal results. The internal mischief is not without external marks of its occurrence. If the scalp is undivided, a puffy tumour forms; and, when it has been injured, the wound degenerates, its surface is pale, and the discharge gleety; the exposed bone appears white and dry. It is also preceded by general disorder of the system, by restlessness and fever; there is sickness, occasional vomiting, shivering, pain of the forehead and back of the neck; in some cases, delirium and convulsions, and perhaps partial paralysis, and ultimately coma. All these symptoms, however, may exist without indicating precisely either the existence or the site of abscess, as I experienced in the following cases.

A middle-aged man was brought intoxicated into the Royal Infirmary with a lacerated wound of the scalp, over the upper part of the occipital bone, on the right side of the mesial line. For thirteen days after the accident he did well, walking about the wards in good health, with the wound healing kindly; but on the fourteenth he became affected with hot skin, restlessness, slight incoherency, severe pain in the head, and intolerance of light, with a full but not quick pulse. A vein was opened, but after three ounces of blood had flowed, he was seized with rigors, vomiting, and violent convulsions; and these symptoms again occurred after the application of leeches to the head. Rigors returned at various intervals; stupor supervened and gradually increased. He became delirious on the eighteenth. A considerable part of the bone was exposed and dead, and there was a puffy swelling of the scalp around the wound. On the nineteenth he lay insensible. A portion of the dead bone was removed by the trephine, and the dura mater was found covered with lymph, but no appearance of effused blood or pus could be perceived. He seemed to suffer nothing from the operation, but continued insensible, passing his urine and feces in bed, with dilated pupils, quick breathing, and subsultus tendinum; his pulse, which had previously never been above 80, now rose to 100. He died on the morning after the operation. On dissection, the right hemisphere of the brain was found of the healthy appearance; but four ounces of pus lay over the left hemisphere, between the dura mater and arachnoid, which latter membrane was of a granular appearance; there was also a small sloughy spot of the dura mater over the left anterior lobe.—A woman, aged 40, fell down and sustained a wound of the scalp on the upper part of the occipital bone on the left side; she suffered but little from the accident, and continued to live freely and irregularly. Seven days after the injury she was seized with shivering: and on the ninth day she lay comatose, voiding her feces and urine involuntarily. The wound was pale and gleety, and the surrounding scalp puffy; the bone was bare and white; pupils dilated; pulse slow. The trephine was applied, and fluctuation felt beneath the exposed dura mater, which was otherwise unchanged in appearance; the membrane was divided by a trifling crucial incision, but only a small quantity of bloody serum escaped. Shortly after the operation she became quite sensible, but again sunk into a state of stupor, with slightly stertorous breathing and contracted pupils. However, all traces of coma disappeared next day, and she recovered soon and perfectly, apparently without having received either benefit or injury from the operation of trephine.

Purulent collections under the cranium, between the bone and dura mater, are not of very frequent occurrence, when symptoms are well watched and treatment properly conducted. But these collections certainly may and do occur, and usually at a considerable period after the accident: many such cases are related by the older authors. Their attendant symptoms are materially different from those of extravasated blood; in the latter case, all the symptoms of compression ensue immediately after the effusion has occurred, and that is generally very shortly after the injury. But matter is not formed till after a considerable period has elapsed; it is not attended with symptoms of compression suddenly supervening, but is preceded by restlessness or febrile excitement; and in the later stages only of the affection do the symptoms of cerebral compression manifest themselves. By the external injury, those bloodvessels by which the dura mater is attached to the skull, and by which it communicates with the pericranium and more external parts, are lacerated, or otherwise materially injured, inflammatory action is excited in the connecting medium, unhealthy suppuration ensues, and by the accumulation of matter, the membrane is completely separated from the cranium, and generally participates in the morbid action. It may ultimately slough and give way, and the matter will then be effused internally. A similar process goes on in regard to the bone and its pericranium, a tumour forms externally, and the bone, being deprived of its supply of blood, necessarily dies, either in part, or throughout its whole thickness. When an external wound exists, the altered appearance of the bone, with the sloughy state of the detached pericranium, gives evident warning of the mischief which is proceeding internally.

The general symptoms of suppuration are the same, whether the collection forms in the substance of the brain, or on its surface. Perhaps the symptoms are not so severe, nor the collection so speedily fatal, when in the substance of the brain, as when situated immediately under the bone, or at the base of the cranium. The external marks already mentioned, are generally indicative of the site of such internal collection, but not uniformly.

Formation of matter in the diploe of the skull, in consequence of external injury, is of rare occurrence; and when it does occur, somewhat similar symptoms and appearances ultimately ensue as when the suppuration commences between the bone and dura mater.

Sometimes the abscess under the bone is of a chronic nature, as in the following case:—The patient, a boy, æt. 11, received a blow on the vertex, after which a puffy tumour formed in the injured scalp, and was freely incised. He afterwards became subject to epileptic fits, which were relieved by copious evacuation of matter from the wound. Exfoliation of the cranium occurred; one small sequestrum was separated, which involved the whole thickness of the bone, and a collection of matter between the dura mater and skull-cap was thereby exposed. The contained matter was evacuated, and the wound was carefully dressed, with the view of procuring adhesion between the membrane and bone, but without effect. The dura mater was ascertained to be extensively detached around the opening; it was found necessary to remove a large portion of bone by means of the trephine and cutting pliers, and then the dura mater soon became united with the integuments of the head. Many months afterwards, the patient complained of severe pain in the back of the neck; an abscess formed in that situation, and, pointing under the right scapula, was opened. Weakness of the right arm and of the inferior extremity suddenly supervened, and the patient gradually sunk. On examination after death, the cervical portion of the spinal chord was found much softened, with infiltration of purulent matter into its substance. The deficiency in the cranium was supplied by a ligamentous expansion, to which the dura mater and scalp adhered intimately.

Of Compression of the Brain.—Compression is produced by extravasation within the cranium of blood or other fluid, by the lodgement of a foreign body on the surface of the brain, or in its substance, or by displacement inwards of portions of the cranial bones; and these causes are usually the effects of external injury. It may either follow the injury instantaneously, or supervene some time thereafter. Many examples have occurred of a patient, at first insensible, with symptoms of concussion, having had the functions of the brain restored almost entirely, and again having relapsed very quickly into a comatose state, in consequence of extravasation of blood. The whole circulation is at first lowered by the shock of the commotion, and the blood scarcely flows in the cerebral vessels; but on its restoration, blood is poured out from the lacerated vessels, or from those which have been so injured in their coats as to be unable to withstand the increasing impulse of their contents. As was already observed, the symptoms of compression are often mixed up with those of commotion, but, when an interval of sensibility has occurred, mistake in diagnosis can scarcely occur. Compression is attended with slow, stertorous breathing; a distinct slow pulse; a relaxed state of the limbs, features, and sphincters; and dilated pupil. Total insensibility to external impressions attends compression of the brain, whatever the cause of it may be. These symptoms may, and do sometimes, gradually disappear after a time. But they may continue unabated, and the patient may gradually sink under them. Or, again, his dissolution may be preceded by excited circulation and furious delirium, the vital powers recovering from their first depression, only to become roused into violent and destructive action, again to sink to a still lower ebb, and be ultimately annihilated. Extravasation is most commonly met with on the lateral parts of the brain in the situation here indicated; the coagulum is perhaps extensive, reaching to the base of the skull, in consequence of rupture of the middle meningeal artery, with or without fracture of the parietal bone.

Little or nothing can be done in cases of compressed brain from extravasation. We possess no means of preventing the effusion, and though we did, the mischief has generally taken place before the patient can receive assistance. Again, the site of the extravasation can seldom be ascertained; and, should that objection to the propriety of surgical interference not exist, still the coagulated blood cannot be evacuated even after extensive removal of the bone. If the coagulum is small, it may be gradually and wholly absorbed, or the brain may become accustomed to the pressure of what remains. It is the surgeon’s duty to take means for averting inflammatory action, and to subdue or moderate it when it has been excited. The symptoms arising from displaced bone may be relieved by surgical operation; but we must premise some observations on fracture, before speaking of the treatment necessary in such cases.

FRACTURES OF THE CRANIAL BONES.

At an early period of life the bones are soft and elastic; they yield readily under external violence, and it requires a great and direct force to produce fracture of them. Late in life, when the diploe disappears, the external and internal tables come in contact; the bone is brittle, and solution of continuity in it is easily effected. And it is wisely so arranged, for thus in the recklessness of childhood and youth, severe blows on the cranium, which are then of so frequent occurrence, are seldom attended or followed with danger; whilst the aged are taught by experience to avoid the unfortunate consequences so apt to result from even a slight blow on the then brittle cranium, by cautiously preserving themselves from exposure to violence.

Solutions of continuity in the cranium, caused by external force, are either attended with depression or not. Fissures, mere capillary rents in the bone, may take place at the part of the cranium which is struck, or on the side opposite to that to which the force is applied. They will be found either short and limited by sutures, or extending in different directions through several sutures, as from the vertex to the base of the skull, and terminating perhaps in the foramen magnum. Fissures in the upper part of the cranium are of themselves attended with comparatively little danger; they produce of themselves no claim to attention, and really require none. But the force which gave rise to the injury of the bone may have disturbed the internal parts; and though the patient may have recovered from the first shock and the immediate effects of the violence, severe and dangerous consequences often result, and at a late period from the infliction of the injury.

Fractures of the base of the skull are the result of great force applied to the lateral parts of the head, to the vertex, or to the base itself through the spinal column. A blow inflicted by an obtuse body on the top of the head, whilst it is at rest and fixed—by producing expansion of the lateral parietes, and forcing the base down upon the upper part of the spinal column—may have the effect of breaking up the connections of the bones at the base, which is the weakest part of the cranium, and splintering them to a greater or less extent. Again, if a person falls from a height, he perhaps alights on some part of his trunk, as the buttocks, and this coming to a state of rest, whilst the head is still in projectile motion, the spinal column is driven towards the cavity of the cranium, and the same effects are thereby produced as in the preceding instance. Or the patient alights on his head, and the base of the cranium is then impinged upon by the weight of the whole trunk, as well as by the force of the projecting power, and in this case also the base is frequently broken up. In the sketch here given, showing extensive fracture of the occipital and sphenoid bones into the foramen magnum, the patient, a brick-layer, fell from a ladder on the vertex. He lay comatose for some days before death: there was found extensive extravasation over the middle lobes and cerebellum. Concussion has resulted from falls when the person has alighted on his nates or feet; but the symptoms attendant on fracture of the base are more generally those of compression of the brain. In this accident the bones are seldom displaced to any great extent; the dura mater is generally lacerated, its bloodvessels, and frequently its sinuses, are wounded, and blood is consequently effused at the base of the brain, where injury is most fatal. The upper part of the brain may bear pressure to a considerable degree without bad consequences ensuing, but compression at the origins of the nerves is always highly dangerous and generally fatal. Bleeding from the nose, mouth, and ears, when attended with other circumstances and symptoms evincing a violent injury and consequent cerebral disturbance, has been considered as decisive of fracture at the base having occurred. But we find that such bleeding happens in slight injuries unattended with any circumstances or consequences to induce a belief that so serious an injury has taken place: and again, in cases where dissection has shown most extensive fracture in the temporal, sphenoid, and æthmoid bones, no blood had issued from their external openings. Fracture of the base of the skull generally proves fatal, but many cases are met with in which there is reason to believe that it had taken place, and yet the patients have recovered with perhaps partial paralysis. Of this I lately met with a good example in the case of a girl seven years of age, whose head had been squeezed between a wall and the back of a cart, and thereby considerably flattened. She lay insensible for several days, with all the symptoms of compression, and with blood flowing in small quantity from the nose, mouth, and right ear. An extensive abscess formed over the right temporal bone. She ultimately recovered, but remained affected with paralysis of the right side of the face and amaurosis of the left eye; sensation in the paralysed parts being quite perfect.

Fractures of the upper part of the cranium are generally attended with displacement to a greater or less extent, and with wound of the cranial coverings. The size of the depressed portion, the depth to which it is displaced, and the extent of wound, will depend upon the nature and intensity of the force applied. When both tables are broken, the fracture of the inner is almost always more extensive than that of the outer one, as fissures will extend furthest in the most brittle part. A broken fragment, comprehending the entire thickness of the skull, presents generally a much larger portion of the inner than of the outer table, so much so that the piece would sometimes not admit of removal, though perfectly detached, without enlarging the opening in the outer table. Fractures, with depression of a considerable portion of one of the flat bones, are sometimes unattended with any alarming symptoms. The effects of the injury soon disappear, and even in cases where the depression has been very considerable, and where, from the escape of brain, it was evident that both this organ and its membranes had been seriously injured, no bad symptoms have occurred to retard the patient’s recovery. Symptoms of compressed brain, however, may generally be expected to attend depression of any considerable portion of bone below its natural level. Still the brain may become accustomed to the pressure, and the symptoms may gradually subside without surgical interference. And if the indications of compression are not very alarming, the coma not very profound, a little delay is allowable, means being taken to avert inflammatory action: for danger is not imminent, the cure may not be expedited by operative aid, and there is chance of injury resulting from rash interference.

But it is in general necessary to remove the cause of the symptoms, to elevate the depressed bone, and take away those portions which may be detached.

It has been said that we must be regulated in our proceedings very much by the existence or not of external wound; that we must be cautious in cutting down upon fractures of the cranium where there is no wound, and so converting a simple into a compound fracture. In fact, so much is the danger increased, it is alleged, by the existence of wound, that the symptoms must be very urgent indeed which would demand division of the integuments in order to admit of examination of the fracture, the application of the trephine, or the elevation of the bone; whilst, on the contrary, if the fracture is exposed by the accident, very slight symptoms will fully warrant performance of the operation of trephine. In other words, it is said that simple fractures should be left to nature, unless under very urgent and alarming circumstances, and that compound ones ought almost always to be interfered with. But the facts are otherwise. The greatest danger of compound fractures of the cranium does not arise from the admission of air. It is not the wound of the scalp, but the mechanical irritation of the brain and its membranes that proves dangerous. Injuries of the cranium inflicted by sharp bodies, such as divide the scalp and cause compound fractures, are generally attended with splintering of the internal table, and require the trephine. The existence of this sort of fracture of itself, without a single bad symptom, without any present disturbance of the sensorial functions, is a sufficient warrant for the application of the trephine, so as to permit the removal of the detached portions of the inner table: and this should be done before inflammatory symptoms have shown themselves. The brittleness of the internal layer of the skull is well known. In fractures inflicted with sharp and pointed instruments, as a bayonet or pike, the corner of a sharp stone, or the heel of a horse’s shoe, the external opening is often very small, it is a mere puncture; in the bone there is a central depression, from which fissures proceed around in a radiated form, and hence the injury has been termed punctured, or starlike fracture. But though the external wound is apparently insignificant, the vitreous table is extensively separated, and, perhaps, broken into innumerable minute and sharp spicula. These sharp portions are driven down upon the dura mater, and by them the membrane is often severely lacerated. If these be not removed soon after the accident, inflammatory action is almost invariably lighted up on the surface of the brain; and we cannot expect to allay or avert such action by general antiphlogistic means, however energetically applied, so long as their exciting cause remains. It is in such cases, I repeat, that the operation of trephining is imperiously called for. Sometimes, however, patients are found to recover from punctured fracture of the cranium, without the operation having been performed, as in the following case, the only one so terminating with which I have met:—On the 4th September, I was consulted by a gentleman, aged 35, who had received a punctured fracture of the cranium, on the 29th of August; a heavy dung fork had fallen from the top of a haystack, and struck him on the upper part of the head. Immediately after the accident he became confused, but not insensible; he lost the power of motion in the right lower extremity, but almost instantly regained it. Next day the right arm became weak, and when I saw him, he was almost wholly unable to move it: he could not bend his fingers, nor raise the arm, and he retained the power of exercising but very slight motion in the elbow-joint. There was a small wound of the scalp, nearly healed, over the posterior part of the left parietal bone, close to the sagittal suture, and nearly midway between its two extremities. A probe passed down to, and through, the bone; and there was slight swelling of the scalp around the wound. He had felt pain in the right ear, and in the forehead, whilst stooping, for some days after the accident. No blood had ever escaped from the ear. A fit of shivering occurred on the night following the injury, but never returned. He soon recovered completely.

I subjoin a case of an opposite description. A coachman was knocked down, late on a Saturday night, and fell with his head on the corner of a stone on which masons had been recently working. After being carried to his lodgings, he recovered from the stupor produced by the combined causes of liquor and blows; and next morning he went to have his head dressed by an apothecary, who with difficulty extracted a fragment of the stone from the wound of the head. The patient then drove a party to church, and probably drank some more whiskey during the day. He afterwards felt indisposed, and was seized with sickness and shivering in the afternoon. On Monday he was in a violent fever, and I saw him in the evening. He had been delirious, but was now lying in a state of stupor. There was a hole in the right parietal bone, capable of admitting the point of the little finger, and many loose fragments of bone were felt lying on the dura mater; a trephine was applied, and numerous spicula were removed. Afterwards, the circulation became much excited, he was bled copiously, and antimony was exhibited in nauseating doses; but he died early on Wednesday morning. On dissection, there were found marks of violent inflammatory action on the surface of the hemispheres. The vessels were unusually numerous and highly engorged, and lymph and pus were effused in considerable quantity, the arachnoid was opaque, and the cerebral substance was somewhat softened. Had the operation been performed at an earlier period, there is every probability that the inflammation, which proved fatal, would have been averted, as in the following instance:—A quarryman received a blow from a sharp stone of considerable size, which rolled down a precipitous bank, and struck him on the vertex. He lay insensible for half an hour, but recovered, and followed his occupation during the rest of the day. In the evening he came for advice. There was a small wound in the scalp, and the subjacent bone was fractured exactly in the same manner as in the former instance, but he felt no uneasy symptoms whatever. The consequences likely to result from such an injury, and the necessity for trephining, were represented to him; he agreed, and the operation was performed on the spot. Many sharp fragments of the inner table were extracted; he proceeded home, never had a bad symptom afterwards, and consequently required no treatment save dressing of the wound.

The operation, if undertaken early, will, in all probability succeed in averting future evil, more especially if the dura mater be not wounded. As a proof of the unfavourable nature of this latter circumstance, I give the following case:—A young man, aged 18, received a kick on the forehead from a horse, September 9th. He remained perfectly sensible, and did not fall to the ground. Shortly after, he was seized with vomiting, which recurred at intervals; his pulse was regular, but feeble; pupils dilated. On the centre of the forehead, there was an irregular wound, which extended to the root of the nose; and on introducing the finger, the os frontis was found fractured, and a small portion of it comminuted and depressed. The trephine was applied, and several detached portions were removed, with some difficulty, from beneath the undepressed portion of the bone. A spiculum had lacerated the dura mater, and penetrated the substance of the brain, to the depth of half an inch; on removing it, a small portion of cerebral matter escaped. The fracture extended apparently in the direction of the right orbit. In the afternoon, the pulse was sixty-four, of good strength, and the pain in the wound had slightly increased. He was bled to fourteen ounces, and ordered an antimonial solution. Afterwards, the pain of the head increased, the pulse rose, the scalp around the wound became the seat of puffy swelling, and several small abscesses formed: the antiphlogistic regimen was rigorously followed, and the abscesses were freely opened as soon as they began to form. On the 21st, a portion of the brain had sloughed, and there was some appearance of fungus cerebri; an incision was made into a swelling over the right temporal muscle, and ℥viii. of blood allowed to flow. On the 22d, several portions of brain were discharged, the pulse was 100, and intermitting. Next day, he was delirious, and a hernia cerebri protruded, of sloughy appearance, and considerable size; pulse 142. Soon afterwards he became comatose; and died early in the morning of the 23d. On dissection, the integuments and pericranium surrounding the aperture, in the frontal bone, were found much thickened, and infiltrated with pus and serum. The dura mater at the wound had a sloughy appearance. There was great effusion of purulent matter, under the dura mater, investing the right hemisphere of the brain; the corresponding tunica arachnoidea was thickened and opaque; and between it and the pia mater there was considerable deposition of lymph and pus. The fungus was collapsed, of a dark colour, soft consistence, and connected with the anterior lobes; the surrounding cerebral matter was much softened, and mixed with pus. The fracture extended through the orbitar plate of the right os frontis, over which lay two small spicula of bone; and a similar fragment was situated over the right optic nerve.