400 BC

                            ON INJURIES OF THE HEAD

                                 by Hippocrates

                          Translated by Francis Adams

 

  MEN'S heads are by no means all like to one another, nor are the

sutures of the head of all men constructed in the same form. Thus,

whoever has a prominence in the anterior part of the head (by

prominence is meant the round protuberant part of the bone which

projects beyond the rest of it), in him the sutures of the head take

the form of the Greek letter tau, T; for the head has the shorter line

running transverse before the prominence, while the other line runs

through the middle of the head, all the way to the neck. But whoever

has the prominence in the back part of the head, in him the sutures

are constructed in quite the opposite form to the former; for in

this case the shorter line runs in front of the prominence, while

the longer runs through the middle all along to the forehead. But

whoever has a prominence of the head both before and behind, in him

the sutures resemble the Greek letter eta E; for the long lines of the

letter run transverse before each prominence while the short one

runs through the middle and terminates in the long lines. But

whoever has no prominence on either part he has the sutures of the

head resembling the Greek letter chi; for the one line comes

transverse to the temple while the other passes along the middle of

the head. The bone at the middle of the head is double, the hardest

and most compact part being the upper portion, where it is connected

with the skin, and the lowest, where it is connected with the meninx

(dura mater); and from the uppermost and lowermost parts the bone

gradually becomes softer and less compact, till you come to the

diploe. The diploe is the most porous, the softest, and most cavernous

part. But the whole bone of the head, with the exception of a small

portion of the uppermost and lowermost portions of it, is like a

sponge; and the bone has in it many juicy substances, like

caruncles; and if one will rub them with the fingers, some blood

will issue from them. There are also in the bone certain very

slender and hollow vessels full of blood. So it is with regard to

hardness, softness, and porosity.

  2. In respect to thickness and thinness; the thinnest and weakest

part of the whole head is the part about the bregma; and the bone

there has the smallest and thinnest covering of flesh upon it, and the

largest proportion of brain is situated in that region of the head.

And hence it happens that from similar or even smaller wounds and

instruments, when a person is wounded to the same or a less degree,

the bone of the head there is more contused, fractured, and depressed;

and that injuries there are more deadly and more difficult to cure;

and it is more difficult to save one's life in injuries there than

in any other part of the head; that from having sustained a similar or

even a less wound a man will die, and that, too, in a shorter space of

time than from a wound in any other part of the head. For the brain

about the bregma feels more quickly and strongly any mischief that may

occur to the flesh or the bone; for the brain about the bregma is in

largest quantity, and is covered by the thinnest bone and the least

flesh. Of the other portions, the weakest is that about the temples;

for it is the conjunction of the lower jaw with the cranium, and there

is motion there up and down as at a joint; and the organ of hearing is

near it; and further, a hollow and important vein runs along the

temple. But the whole bone of the head behind the vertex and the ear

is stronger than the whole anterior part, and the bone itself has a

larger and deeper covering of flesh upon it. And hence it follows,

that when exposed to the same or even greater injuries from

instruments of the same or greater size, the bone is less liable to be

fractured and depressed than elsewhere; and that in a fatal accident

the patient will live longer when the wound is in the posterior part

of the head than when elsewhere; and that pus takes longer time to

form and penetrate through the bone to the brain, owing to the

thickness of the bone; and moreover, as there is less brain in that

part of the head, more persons who are wounded in the back part of the

head escape than of those who wounded in the anterior part. And in

fatal cases, a man will survive longer in winter than in summer,

whatever be the part of the head in which the wound is situated.

  3. As to the haedrae (dints or marks?) of sharp and light weapons,

when they take place in the bone without fissure, contusion, or

depression inwards (and these take place equally in the anterior and

posterior part of the head), death, when it does occur, does not

properly result from them. A suture appearing in a wound, when the

bone is laid bare, on whatever part of the head the wound may have

been inflicted, is the weakest point of the head to resist a blow or a

weapon, when the weapon happens to be impinged into the suture itself;

but more especially when this occurs in the bregma at the weakest part

of the head, and the sutures happen to be situated near the wound, and

the weapon has hit the sutures themselves.

  4. The bone in the head is liable to in the following modes, and

there are many varieties in each of these modes of fracture: When a

wounded bone breaks, in the bone comprehending the fissure,

contusion necessarily takes place where the bone is broken; for an

instrument that breaks the bone occasions a contusion thereof more

or less, both at the fracture and in the parts of the bone surrounding

the fracture. This is the first mode. But there are all possible

varieties of fissures; for some of them are fine, and so very fine

that they cannot be discovered, either immediately after the injury,

or during the period in which it would be of use to the patient if

this could be ascertained. And some of these fissures are thicker

and wider, certain of them being very wide. And some of them extend to

a greater, and some to a smaller, distance. And some are more

straight, nay, completely straight; and some are more curved, and that

in a remarkable degree. And some are deep, so as to extend downwards

and through the whole bone; and some are less so, and do not penetrate

through the whole bone.

  5. But a bone may be contused, and yet remain in its natural

condition without any fracture in it; this is the second mode. And

there are many varieties of contusion; for they occur to a greater

or less degree, and to a greater depth, so as sometimes to extend

through the whole bone; or to a less depth, so as not to extend

through the whole bone; and to a greater and smaller length and

breadth. But it is not possible to recognize any of these varieties by

the sight, so as to determine their form and extent; neither,

indeed, is it visible to the eyes when any mischief of this kind takes

place, and immediately after the injury, whether or not the bone has

been actually bruised, as is likewise the case with certain

fractures at a distance from the seat of injury.

  6. And the bone being fractured, is sometimes depressed inwards from

its natural level along with the fractures, otherwise there would be

no depression; for the depressed portion being fractured and broken

off, is pushed inwards, while the rest of the bone remains in its

natural position; and in this manner a fracture is combined with the

depression. This is the third mode. There are many varieties of

depression, for it may comprehend a greater and a small extent of

bone, and may either be to a greater depth, or less so, and more

superficial.

  7. When a hedra, or dint of a weapon, takes place in a bone, there

may be a fracture combined with it; and provided there be a

fracture, contusion must necessarily be joined, to a greater or less

extent, in the seat of the dint and fracture, and in the bone which

comprehends them. This is the fourth mode. And there may be a hedra,

or indentation of the bone, along with contusion of the surrounding

bone, but without any fracture either in the hedra or in the contusion

inflicted by the weapon. But the indentation of a weapon takes place

in a bone, and is called hedra, when the bone remaining in its natural

state, the weapon which struck against the bone leaves its

impression on the part which it struck. In each of these modes there

are many varieties, with regard to the contusion and fracture, if both

these be combined with the hedra, or if contusion alone, as it has

been already stated that there are many varieties of contusion and

fracture. And the hedra, or dint, of itself may be longer and shorter,

crooked, straight, and circular; and there are many varieties of

this mode, according to the shape of the weapon; and they may be

more or less deep, and narrower or broader, and extremely broad.

When a part is cleft, the cleft or notch which occurs in the bone,

to whatever length or breadth, is a hedra, if the other bones

comprehending the cleft remain in their natural position, and be not

driven inwards; for in this case it would be a depression, and no

longer a hedra.

  8. A bone may be injured in a different part of the head from that

on which the person has received the wound, and the bone has been laid

bare. This is the fifth mode. And for this misfortune, when it occurs,

there is no remedy; for when this mischief takes place, there is no

means of ascertaining by any examination whether or not it has

occurred, or on what part of the head.

  9. Of these modes of fracture, the following require trepanning: the

contusion, whether the bone be laid bare or not; and the fissure,

whether apparent or not. And if, when an indentation (hedra) by a

weapon takes place in a bone it be attended with fracture and

contusion, and even if contusion alone, without fracture, be

combined with the indentation, it requires trepanning. A bone

depressed from position rarely requires trepanning; and those which

are most pressed and broken require trepanning the least; neither does

an indentation (hedra) without fracture and contusion require

trepanning; nor does a notch, provided it is large and wide; for a

notch and a hedra are the same.

  10. In the first place, one must examine the wounded person, in what

part of the head the wound is situated, whether in the stronger or

weaker parts; and ascertain respecting the hairs about the wound,

whether they have been cut off by the instrument, and have gone into

the wound; and if so, one should declare that the bone runs the risk

of being denuded of flesh, and of having sustained some injury from

the weapon. These things one should say from a distant inspection, and

before laying a hand on the man; but on a close examination one should

endeavor to ascertain clearly whether the bone be denuded of flesh

or not; and if the denuded bone be visible to the eyes, this will be

enough; but otherwise an otherwise an examination must be made with

the sound. And if you find the bone denuded of the flesh, and not safe

from the wound, you must first ascertain the state of the bone, and

the extent of the mischief, and of what assistance it stands in

need. One should also inquire of the wounded person how and in what

way he sustained the injury; and if it be not apparent whether the

bone has sustained an injury or not, it will be still more

necessary, provided the bone be denuded, to make inquiry how the wound

occurred, and in what manner; for when contusions and fractures

exist in the bone, but are not apparent, we must ascertain, in the

first place from the patient's answers, whether or not the bone has

sustained any such injuries, and then find out the nature of the

case by word and deed, with the exception of sounding. For sounding

does not discover to us whether the bone has sustained any of these

injuries or not; but sounding discovers to us an indentation inflicted

by a weapon, and whether a bone be depressed from its natural

position, and whether the bone be strongly fractured; all which may

also be ascertained visibly with the eyes.

  11. And a bone sustains fractures, either so fine as to escape the

sight, or such as are apparent, and contusions which are not apparent,

and depression from its natural position, especially when one person

is intentionally wounded by another, or when, whether intentionally or

not, a blow or stroke is received from an elevated place, and if the

instrument in the hand, whether used in throwing or striking, be of

a powerful nature, and if a stronger person wound a weaker. Of those

who are wounded in the parts about the bone, or in the bone itself, by

a fall, he who falls from a very high place upon a very hard and blunt

object is in most danger of sustaining a fracture and contusion of the

bone, and of having it depressed from its natural position; whereas he

that falls upon more level ground, and upon a softer object, is likely

to suffer less injury in the bone, or it may not be injured at all. Of

those instruments which, falling upon the head, wound the parts

about the bone, or the bone itself, that which falls from a very

high place, and the least on a level with the person struck, and which

is at the same time very hard, very blunt, and very heavy, and which

is the least light, sharp, and soft, such an instrument would occasion

a fracture and contusion of the bone. And there is most danger that

the bone may sustain these injuries, under such circumstances, when

the wound is direct and perpendicular to the bone, whether struck from

the hand or from a throw, or when any object falls upon the person, or

when he is wounded by falling, or in whatever way the bone sustains

a direct wound from this instrument. Those weapons which graze the

bone obliquely are less apt to fracture, contuse, or depress the bone,

even when the bone is denuded of flesh; for in some of those wounds

thus inflicted the bone is not laid bare of the flesh. Those

instruments more especially produce fractures in the bone, whether

apparent or not, and contusions, and inward depression of the bone,

which are rounded, globular, smooth on all sides, blunt, heavy, and

hard; and such weapons bruise, compress, and pound the flesh; and

the wounds inflicted by such instruments, whether obliquely or

circularly, are round, and are more disposed to suppurate, and to have

a discharge, and take longer time to become clean; for the flesh which

has been bruised and pounded must necessarily suppurate and slough

away. But weapons of an oblong form, being, for the most part,

slender, sharp, and light, penetrate the flesh rather than bruise

it, and the bone in like manner; and such an instrument may occasion a

hedra and a cut (for a hedra and a cut are same thing); but weapons of

this description do not produce contusions, nor fractures, nor

depressions inwardly. And in addition the appearances in the bone,

which you call detect by the sight, you should make inquiry as to

all these particulars (for they are symptoms of a greater or less

injury), whether the wounded person was stunned, and whether

darkness was diffused over his eyes, and whether he had vertigo, and

fell to the ground.

  12. When the bone happens to be denuded of flesh by the weapon,

and when the wound occurs upon the sutures, it is difficult to

distinguish the indentation (hedra) of a weapon which is clearly

recognized in other parts of the bone, whether it exist or not, and

especially if the hedra be seated in the sutures themselves. For the

suture being rougher than the rest of the bone occasions confusion,

and it is not clear which is the suture, and which the mark

inflicted by the instrument, unless the latter (hedra) be large.

Fracture also for the most part is combined with the indentation

when it occurs in the sutures; and this fracture is more difficult

to discern when the bone is broken, on this account, that if there

be a fracture, it is situated for the most part in the suture. For the

bone is liable to be broken and slackened there, owing to the

natural weakness of the bone there, and to its porosity, and from

the suture being readily ruptured and slackened: but the other bones

which surround the suture remain unbroken, because they are stronger

than the suture. For the fracture which occurs at the suture is also a

slackening of the suture, and it is not easy to detect whether the

bone be broken and slackened by the indentation of a weapon

occurring in the suture, or from a contusion of the bone at the

sutures; but it is still more difficult to detect a fracture connected

with contusion. For the sutures, having the appearance of fissures,

elude the discernment and sight of the physician, as being rougher

than the rest of the bone, unless the bone be strongly cut and

slackened (for a cut and a hedra are the same thing). But it is

necessary, if the wound has occurred at the sutures, and the weapon

has impinged on the bone or the parts about it, to pay attention and

find out what injury the bone has sustained. For a person wounded to

the same, or a much smaller, extent, and by weapons of the same size

and quality, and even much less, will sustain a much greater injury,

provided he has received the blow at the sutures, than if it was

elsewhere. And many of these require trepanning, but you must not

apply the trepan to the sutures themselves, but on the adjoining bone.

  13. And with regard to the cure of wounds in the head, and the

mode of detecting injuries in the bone which are not apparent, the

following is my opinion:- In a wound of the head, you must not apply

anything liquid, not even wine, but as little as possible, nor a

cataplasm, nor conduct the treatment with tents, nor apply a bandage

to an ulcer on the head, unless it be situated on the forehead, in the

part which is bare of hairs, or about the eyebrow and eye, for

wounds occurring there require cataplasms and bandages more than

upon any other part of the head. For the rest of the head surrounds

the whole forehead, and the wounds wherever situated become inflamed

and swelled, owing to an influx of blood from surrounding parts. And

neither must you apply cataplasms and bandages to the forehead at

all times; but when the inflammation is stopped and the swelling has

subsided, you must give up the cataplasms and bandages. A wound in any

other part of the head must not be treated with tents, bandages, or

cataplasms, unless it also requires incision. You must perform

incision on wounds situated on the head and forehead, whenever the

bone is denuded of flesh, and appears to have sustained some injury

from the blow, but the wound has not sufficient length and breadth for

the inspection of the bone, so that it may be seen whether it has

received any mischief from the blow, and of what nature the injury is,

and to what extent the flesh has been contused, and whether the bone

has sustained any injury, or whether it be uninjured by the blow,

and has suffered no mischief; and with regard to the treatment, what

the wound, and the flesh, and the injury of the bone stand in need of.

Ulcers of this description stand in need of incision; and, if the bone

be denuded of the flesh, and if it be hollow, and extend far

obliquely, we cut up the cavity wherever the medicine cannot penetrate

readily, whatever medicine it may be; and wounds which are more

inclined to be circular and hollow, and for the most part others of

the like shape, are cut up by making double incision in the circle

lengthways,, according to the figure of the man, so as to make the

wound of a long form. Incisions may be practiced with impunity on

other parts of the head, with the exception of the temple and the

parts above it, where there is a vein that runs across the temple,

in which region an incision is not to be made. For convulsions seize

on a person who has been thus treated; and if the incision be on the

left temple, the convulsions seize on the right side; and if the

incision be on the right side, the convulsions take place on the

left side.

  14. When, then, you lay open a wound in the head on account of the

bones having been denuded of the flesh, as wishing to ascertain

whether or not the bone has received an injury from the blow, you must

make an incision proportionate to the size of the wound, and as much

as shall be judged necessary. And in making the incision you must

separate the flesh from the bone where it is united to the membrane

(pericranium?) and to the bone, and then fill the whole wound with a

tent, which will expand the wound very wide next day with as little

pain as possible; and along with the tents apply a cataplasm,

consisting of a mass (maza) of fine flour pounded in vinegar, or

boiled so as to render it as glutinous as possible. On the next day,

when you remove the tent, having examined the bone to see what

injury it has sustained, if the wound in the bone be not right seen by

you, nor can you discover what mischief the bone itself has sustained,

but the instrument seems to have penetrated to the bone so as to

have injured it, you must scrape the bone with a raspatory to a

depth and length proportionate to the suture of the patient, and again

in a transverse direction, for the sake of the fractures which are not

seen, and of the contusions which are not discovered, as not being

accompanied with depression of the bone from its natural position. For

the scraping discovers the mischief, if the injuries in the bone be

not otherwise manifest. And if you perceive an indentation (hedra)

left in the bone by the blow, you must scrape the dint itself and

the surrounding bones, lest, as often happens, there should be a

fracture and contusion, or a contusion alone, combined with the

dint, and escape observation. And when you scrape the bone with the

raspatory, and it appears that the wound in the bone requires the

operation, you must not postpone it for three days, but do it during

this period, more especially if the weather be hot, and you have had

the management of the treatment from commencement. If you suspect that

the bone is broken or contused, or has sustained both these

injuries, having formed your judgement from the severity of the wound,

and from the information of the patient, as that the person who

inflicted the wound, provided it was done by another person, was

remarkably strong, and that the weapon by which he was wounded was

of a dangerous description, and then that the man had been seized with

vertigo, dimness of vision, and stupor, and fell to the ground,- under

these circumstances, if you cannot discover whether the bone be

broken, contused, or both the one and the other, nor can see the truth

of the matter, you must dissolve the jet-black ointment, and fill

the wound with it when this dissolved, and apply a linen rag smeared

with oil, and then a cataplasm of the maza with a bandage; and on

the next day, having cleaned out the wound, scrape the bone with the

raspatory. And if the bone is not sound, but fractured and contused,

the rest of it which is scraped will be white; but the fracture and

contusion, having imbibed the preparation, will appear black, while

the rest of the bone is white. And you must again scrape more deeply

the fracture where it appears black; and, if you thus remove the

fissure, and cause it to disappear, you may conclude that there has

been a contusion of the bone to a greater or less extent, which has

occasioned the fracture that has disappeared under the raspatory;

but it is less dangerous, and a matter of less consequence, when the

fissure has been effaced. But if the fracture extend deep, and do

not seem likely to disappear when scraped, such an accident requires

trepanning. But having performed this operation, you must apply the

other treatment to the wound.

  15. You must be upon your guard lest the bone sustain any injury

from the fleshy parts if not properly treated. When the bone has

been sawed and otherwise denuded, whether it be actually sound, or

only appears to be so, but has sustained some injury from the blow,

there may be danger of its suppurating (although it would not

otherwise have done so), if the flesh which surrounds the bone be

ill cured, and become inflamed and strangled; for it gets into a

febrile state, and becomes much inflamed. For the bone acquires heat

and inflammation from the surrounding flesh, along with irritation and

throbbing, and the other mischiefs which are in the flesh itself,

and from these it gets into a state of suppuration. It is a bad

thing for the flesh (granulations?) in an ulcer to be moist and

mouldy, and to require a long time to become clean. But the wound

should be made to suppurate as quickly as possible; for, thus the

parts surrounding the wound would be the least disposed to

inflammation, and would become the soonest clean; for the flesh

which has been chopped and bruised by the blow, must necessarily

suppurate and slough away. But when cleaned the wound must be dried,

for thus the wound will most speedily become whole, when flesh

devoid of humors grows up, and thus there will be no fungous flesh

in the sore. The same thing applies to the membrane which surrounds

the brain: for when, by sawing the bone, and removing it from the

meninx, you lay the latter bare, you must make it clean and dry as

quickly as possible, lest being in a moist state for a considerable

time, it become soaked therewith and swelled; for when these things

occur, there is danger of its mortifying.

  16. A piece of bone that must separate from the rest of the bone, in

consequence of a wound in the head, either from the indentation

(hedra) of a blow in the bone, or from the bone being otherwise

denuded for a long time, separates mostly by becoming exsanguous.

For the bone becomes dried up and loses its blood by time and a

multiplicity of medicines which are used; and the separation will take

place most quickly, if one having cleaned the wound as quickly as

possible will next dry it, and the piece of bone, whether larger or

smaller. For a piece of bone which is quickly dried and converted,

as it were, into a shell, is most readily separated from the rest of

the bone which retains its blood and vitality; for, the part having

become exsanguous and dry, more readily drops off from that which

retains its blood and is alive.

  17. Such pieces of bone as are depressed from their natural

position, either being broken off or chopped off to a considerable

extent, are attended with less danger, provided the membrane he

safe; and bones which are broken by numerous and broader fractures are

still less dangerous and more easily extracted. And you must not

trepan any of them, nor run any risks in attempting to extract the

pieces of bone, until they rise up of their own accord, upon the

subsidence of the swelling. They rise up when the flesh (granulations)

grows below, and it grows from the diploe of the bone, and from the

sound portion, provided the upper table alone be in a state of

necrosis. And the flesh will shoot up and grow below the more quickly,

and the pieces of bone ascend, if one will get the wound to

suppurate and make it clean as quickly as possible. And when both

the tables of the bone are driven in upon the membrane, I mean the

upper and lower, the wound, if treated in the same way, will very soon

get well, and the depressed bones will quickly rise up.

  18. The bones of children are thinner and softer, for this reason,

that they contain more blood [than those of adults]; and they are

porous and spongy, and neither dense nor hard. And when wounded to a

similar or inferior degree by weapons of the same or even of an

inferior power, the bone of a young person more readily and quickly

suppurates, and that in less time than the bone of an older person;

and in accidents, which are to prove fatal, the younger person will

die sooner than the elder. But if the bone is laid bare of flesh,

one must attend and try to find out, what even is not obvious to the

sight, and discover whether the bone be broken and contused, or only

contused; and if, when there is an indentation in the bone, whether

contusion, or fracture, or both be joined to it; and if the bone has

sustained any of these injuries, we must give issue to the blood by

perforating the bone with a small trepan, observing the greatest

precautions, for the bone of young persons is thinner and more

superficial than that of elder persons.

  19. When a person has sustained a mortal wound on the head, which

cannot be cured, nor his life preserved, you may form an opinion of

his approaching dissolution, and foretell what is to happen from the

following symptoms which such a person experiences. When a bone is

broken, or cleft, or contused, or otherwise injured, and when by

mistake it has not been discovered, and neither the raspatory nor

trepan has been applied as required, but the case has been neglected

as if the bone were sound, fever will generally come on if in

winter, and in summer the fever usually seizes after seven days. And

when this happens, the wound loses its color, and the inflammation

dies in it; and it becomes glutinous, and appears like a pickle, being

of a tawny and somewhat livid color; and the bone then begins to

sphacelate, and turns black where it was white before, and at last

becomes pale and blanched. But when suppuration is fairly

established in it, small blisters form on the tongue and he dies

delirious. And, for the most part, convulsions seize the other side of

the body; for, if the wound be situated on the left side, the

convulsions will seize the right side of the body; or if the wound

be on the right side of the head, the convulsion attacks the left side

of the body. And some become apoplectic. And thus they die before

the end of seven days, if in summer; and before fourteen, if in

winter. And these symptoms indicate, in the same manner, whether the

wound be older or more recent. But if you perceive that fever is

coming on, and that any of these symptoms accompany it, you must not

put off, but having sawed the bone to the membrane (meninx), or

scraped it with a raspatory (and it is then easily sawed or

scraped), you must apply the other treatment as may seem proper,

attention being paid to circumstances.

  20. When in any wound of the head, whether the man has been

trepanned or not, but the bone has been laid bare, a red and

erysipelatous swelling supervenes in the face, and in both eyes, or in

either of them, and if the swelling be painful to the touch, and if

fever and rigor come on, and if the wound look well, whether as

regards the flesh or the bone, and if the parts surrounding the

wound be well, except the swelling in the face, and if the swelling be

not connected with any error in the regimen, you must purge the bowels

in such a case with a medicine which will evacuate bile; and when thus

purged the fever goes off, the swelling subsides, and the patient gets

well. In giving the medicine you must pay attention to the strength of

the patient.

  21. With regard to trepanning, when there is a necessity for it, the

following particulars should be known. If you have had the

management of the case from the first, you must not at once saw the

bone down to the meninx; for it is not proper that the membrane should

be laid bare and exposed to injuries for a length of time,as in the

end it may become it may become fungous. And and there is another

danger if you saw the bone down to the meninx and remove it at once,

lest in the act of sawing you should wound the meninx. But in

trepanning, when only a very little of the bone remains to be sawed

through, and the bone can be moved, you must desist from sawing, and

leave the bone to fall out of itself. For to a bone not sawed through,

and where a portion is left of the sawing, no mischief can happen; for

the portion now left is sufficiently thin. In other respects you

must conduct the treatment as may appear suitable to the wound. And in

trepanning you must frequently remove the trepan, on account of the

heat in the bone, and plunge it in cold water. For the trepan being

heated by running round, and heating and drying the bone, burns it and

makes a larger piece of bone around the sawing to drop off, than would

otherwise do. And if you wish to saw at once down to the membrane, and

then remove the bone, you must also, in like manner, frequently take

out the trepan and dip it in cold water. But if you have not charge of

the treatment from the first, but undertake it from another after a

time, you must saw the bone at once down to the meninx with a serrated

trepan, and in doing so must frequently take out the trepan and

examine with a sound (specillum), and otherwise along the tract of the

instrument. For the bone is much sooner sawn through, provided there

be matter below it and in it, and it often happens that the bone is

more superficial, especially if the wound is situated in that part

of the head where the bone is rather thinner than in other parts.

But you must take care where you apply the trepan, and see that you do

so only where it appears to be particularly thick, and having fixed

the instrument there, that you frequently make examinations and

endeavor by moving the bone to bring it up. Having removed it, you

must apply the other suitable remedies to the wound. And if, when

you have the management of the treatment from the first, you wish to

saw through the bone at once, and remove it from the membrane, you

must, in like manner, examine the tract of the instrument frequently

with the sound, and see that it is fixed on the thickest part of the

bone, and endeavor to remove the bone by moving it about. But if you

use a perforator (trepan?), you must not penetrate to the membrane, if

you operate on a case which you have had the charge of from the first,

but must leave a thin scale of bone, as described in the process of

sawing.

                            -THE END-