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commune. Cominon

Gex. I. B. Bell's valuable treatise on ulcers *; and most of all Spec. I.

(to the present author, at least, most of all) that his Apostema

friend Dr. Parr, with all the light of his contemporaries

before him, should have offered it as his own opinion, aposteme.

in his elaborate and upon the whole very excellent Medical Dictionary; in which he tells us, after M. Gaber, that the pus of an abscess "consists of the substance of the vessels, and of the cellular membrane dissolved in the

serum." That pus. That pus, instead of being a mere solution of dead is a distinct secretion, animal matter, is a distinct and peculiar secretion, is now notorious in known to most practitioners from personal observation, the present day. who must have witnessed it repeatedly in situations in

which there has been no ulceration or breach of structure, and consequently where there could be no dead

animal matter to dissolve. Often found It was noticed in this form by De Haen so far back as where it can be no

the middle of last century; and was pointed out by Mr. thing else. Hewson as frequently found, on dissections, on the sur

face of the pleura, the peritoneum, the pericardium, in a Still further perfectly genuine state. A very decided case, to which

both Dr. Hunter and Mr. J. Hunter were witnesses, was published by Mr. Samuel Sharp about the same time that De Haen first brought the subject before the public. Nothing is more common or more copious than the secretion of pus without ulceration in the first stage of purulent

ophthalmy, and in purulent inflammation of the mucous Singular , membrane of the glans penis; and I remember having discharge of bus from attended about twelve years since a gentleman in Bedthe urethra. ford Row, who had irritated the urethra by improperly

introducing a bougie into the bladder, and about three days afterwards discharged with his water not less than half a pint of pure pus, which separated itself from the water, and subsided, and thus gave me an opportunity of examining it minutely. I requested Mr. Cline's attention to this case, and we saw not the slightest reason for suspecting any ulceration whatever.

illustrated.

Part I. Sect. iii.

Common

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Genuine pus is peculiarly distinguished by its consist- Gen. I.

SPEC. I. ing of white globules swimming in a fluid, which to the

Apostema eye has the appearance of serum, but possesses charac- commune. ters of its own, equally different from those of serum and a

aposteme. of every other secretion we are acquainted with ; and Distinctive which render it coagulable in a saturated solution of mu- character of riate of ammonia, which is its specific test. Pus, however, is not globular at its first formation, but a transparent fluid of a consistence in some sort resembling jelly ; the globules are produced while it lies on the surface of the sore, usually, when not exposed to external air, in about fifteen minutes after its secernment. The perfection of pus seems to depend upon the large proportion which its globules bear to its other parts. It is specifically heavier than water, and approaches nearly to that of blood. It has a sweetish, mawkish taste (apparently from its containing sugar), very different from that of most other secretions. After putrefaction it evinces an acid. Dr. Bruggmans, who has analyzed it with much care, asserts that it has an acid also before putrefaction ; but this has been denied by Sir Everard Home*. For a further account of its chemical properties, the reader may consult Dr. Pearson's elaborate paper on this subject in the Philosophocal Transactionst. In the process of the natural cure of an aposteme, we Granulation

cand incarnafind that the stage of granulation, and consequently of tion. incarnation, immediately succeeds that of ulceration or the removal of the dead matter. “ The vessels ”, says Mr. Hunter, “ forming themselves into a certain structure which fits them for secreting pus, it is so ordered that the same structure also fits them for producing granulations; and thus these two processes are concomitant effects of the same cause, which cause is a peculiar organization superadded to the vessels of the part.” I The idea of a change of organization is hypothetical, Change of

organization

hypothetical, • Dissertation on the Properties of Pus, p. 20.

but perhaps + Vol. 1809, p. 313. See also a further description under Marasmus correct. Phthisis in the sequel of the present volume.

On Inflammation. Of Pus, p. 433.

Gen. I. but ingenious, and perhaps correct. Change of action Spec. I.

and change of effect we know; but at the rest we can at Apostema commune, present only give a guess, and must leave it to future Common

times to ascertain. aposteme. Use of gra

The obvious design of granulation or incarnation, as nulation. it is often called, is that of repairing the loss the parts

have sustained by the injury done: it is that of producing How it takes new flesh. Granulation, like vegetation, takes place from place,

the centre below, in a direction upwards towards the skin; and hence exactly contrary to the course of ulceration, which always begins in the superior part of an abscess. The process commonly succeeds best upon exposure to the air, or at least after an opening externally,

though there are instances of its having occurred where and what the there has been no exposure whatever. The granulating pullulations consist of, pullulations, according to Mr. Hunter's explanation, according to consist of exudations of coagulating lymph from the J. Hunter.

vessels. He conceives it probable not only that the old vessels extend into these pullulations and become elongated, but that new vessels also form in them, and, like the old, still continue to secrete pus. The granulations, as they become formed, mutually and readily unite; inosculation or the attraction of cohesion is established be tween them; and their vessels thus joined are transformed from secreting into circulating tubes. Immediately upon their formation, cicatrization seems to be in view. The parts which had receded, in consequence of a breach being made into them, begin now from their natural elasticity, and probably from muscular contraction, to be brought nearer together by the new-created substance; and the contraction of the sore proves a sign that cicatrization is speedily about to follow. This contraction takes place in every point, but principally from edge to edge, which brings the circumference of the sore towards the centre: so that the exposed surface becomes smaller and smaller, even before there is any formation of a new

• skin. Two parts There are two parts, at least, of this wonderful economy Sortire that still demand explanation. The first is the real use

The use of

of the pus after it is secreted: and the second, the means Gen. I. by which the absorbents carry off the dead matter. The

Spec. I.

Apostema same explanation may perhaps apply to both.

commune. That pus is a peculiar secretion distinguished by pe

Common

per aposteme. culiar properties, and not a solution of the dead animal process that matter which it is the design of nature to remove, has still require already been sufficiently shown. “But I am apt to be

explanation, lieve”, says Mr. Hunter, " that we are not yet well, the pus: or perhaps not at all, acquainted with its use, for it is common to all sores; takes place in the most perfect degree in those sores which may be said to be the most healthy, and especially in those where the constitution is most healthy."* It forms indeed, an exit to foreign bodies : is supposed by many to carry off humours from the constitution, or convert general into local complaints; and by others to act as a preventive of numerous diseases. Yet all these services, even admitting them to exist, are but secondary, and the final intention still remains to be accounted for. - In like manner, since the dead matter of an aposteme and does not constitute the pus that is found in it, and hence becomes can only be carried off by absorption, we have yet also to fitted for

absorption. learn by what means it becomes prepared for an entrance into the delicate mouths of the absorbent vessels. There is no small difficulty in conceiving how these very minute mouths can apply themselves with sufficient activity to the various tough and hard substances they have to remove, as tendon and bone, when in close contact with them; but, as soon as the dead part becomes separated from the living, they are often no longer in close contact with them, except at the base, where there is little or no absorption at all; and in many cases, as in boils, These difficarbuncles, and other imperfectly suppurating tumours,

plained possessing cores or tenacious sloughs, are at a considerable distance from them, with the entire body of the contained pus placed intermediately in the hollow,

In the last case it seems impossible for them to act

dead matter

culties ex

th the entisare at a coumours, cultiere di

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commune. Common

the kind

Gen. I. except through the medium of the pus; in reality except Spec. I.

through a solvent power possessed by the pus and exerAposterna

cised upon the matter to be removed. And if such be

the nature of the action in this case, it is doubtless the aposteme. Pus pos nature of the action in all other cases; and hence we sesses a sol- arrive at one immediate and direct use of pus, which is, vent power: yet not of that of becoming a solvent of the dead animal matter that

requires to be carried off: not, indeed, by converting the supposed formerly: whole substance at once into a solid mass, and still less and hence, into a fluid mass of its own nature, as supposed by Sir one import- John Pringle, but only the surface of the substance to ant use of this fluid. which it is applied: and which hereby is rendered fit for

absorption, carried forward to the mouths of the imbibing vessels, and absorbed accordingly. And as the same power is exerted in succession upon every fresh surface of the dead matter that becomes exposed to its action, the whole is at length carried away, and a cavity pro

duced where before was solid substance. How far

That pus first kills and then dissolves the organized Hewson's view cor. matter of an abscess was, as we have already seen, the

opinion of Mr. Hewson. In the first part of this opinion he was completely mistaken; for, as we have already observed, the organized matter is dead before the process of suppuration even commences; in the second, he seems to a certain extent to have been correct, though he still erred in supposing the dead substance to be melted down

into its own nature, and was unacquainted with the imHow far portant process of its absorption. But in advancing his Hunter's

own full and more elaborate hypothesis against the misview erro

take of Mr. Hewson, Mr. Hunter ran into the opposite extreme; and contended that pus is not designed to be a solvent at all, and that animal substances are decomposed in it with very great difficulty: thus leaving us totally at a loss to account for its use; and equally so to explain the manner in which the mouths of the absorbents of an abscess can operate upon or even, in many in

stances, get at the material they are to remove. Hunter's Mr. Hunter, however, with the candour that so pecuappeal to experiments. liarly belonged to him, made this question a subject of

rect.

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