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SECT. I. CHAP. VIII. Of a Peripneumony, or Inflammation of the Lungs.
APeripneumony is usually defined to be, an inflammation of the Lungs with an acute Feaver, a Cough, and difficult breathing. They who labour with this distemper are greatly sensible of a notable inflammation in their breast with a swelling of the Lungs, and sometiems a pricking pain, they draw a painful and short breath, or, as Hippocrates affirms, a deep breath; the Feaver presses with great thirst, watching, and painful Cough; whereto also bloody spittle, or streakt with blood, suc∣ceeds. By which Symptoms it clearly appears, that this disease arises, in as much as the blood boiling feaverishly, doth not easily pass through the lesser pneumonic Vessels; but sticking in their passages, begets first an obstruction, afterwards being more heaped and extravasated, propagates a Phlegmon or inflammation with heat, a Cough, and dis∣coloured spittle. Moreover in as much as the blood so accumulated and stagnating, puffs up these passages of the Lungs, and compresses them, a difficulty of breathing is caused; and in as much as it pulls or distends the nervous Fibres, a pain frequently arises.
But if it be asked, how a Phlegmon should grow together in the frame of a Lung meerly bladdery and excarnous; and after what manner it is distinguished from that distemper which is wont to be stirred up in musculous flesh, or the substance of a bowel? We must answer, although the above-mentioned parts vary as to the texture, notwithstanding the reason of the affect is altogether the same in each of them. For the small sanguiferous vessels do every where alike embrace, bind, and variously gird about both all the Tracheal passages in the Lungs, and also the fleshy fibres in the Muscles, and lastly the little fibres and nervous threds, with the thickest foldings like clusters, of the Parenchyma. But that which produces a Phlegmon is the blood it self, which, while it grows very hot, and is hindred in its passage, every where, and espe∣cially in the Lungs, whose vessels branch into very small foldings, doth first beget an obstruction, and then an inflammation.
Wherefore the formal reason and conjunct cause of a Peripneumony consists in these two things, viz. that the blood boils feaverishly, and sticking also within the more nar∣row passages of the Lungs, engenders there an obstruction causing inflammation. Un∣less these two things concur, there is an exemption from this disease; for in many other Feavers, especially in a burning Ague, though the blood, most intensly heated and inflaming all the Praecordia, as also in the longing of women, the Green-sickness and the Dropsie of the breast, is very clammy, yet though sticking very much in the pas∣sages of the Lungs, it does not stir up a Peripneumony: to produce which both distem∣pers must concur and join their strength. Nevertheless when there is an indisposition of both these, one while this, another while that, is first in act, and after a sort one is the cause, or at least the occasion of the other. For sometimes the blood irritated into a Feaver causes an obstruction of the Lungs; and the blood also sometimes finding a re∣mora in the Lungs, receives a feaverish boiling from its proper obstruction. Notwith∣standing, for the constituting the procatarctic cause of this disease, the blood ought to be fitted as well for the boiling, as for the obstructing the vessels of the Lungs.
Though it will not be easie to shew what this disposition of the bloody liquor is in∣clining to a Peripneumony, yet the reason thereof doth something appear by Phlebo∣tomy, always made use of in this disease with the best success. For the blood being drawn from any labouring with this disease, as also from those in a Pleurisie, after it grows cold, in its superficies instead of a Scarlet cream, it hath a little film somewhat white or otherwise discoloured growing on it, which also is very tough and viscous: whence we may conjecture, that the mass of blood being too strait in its frame, whilst that in the circulation it doth not discharge its recrements, grows too thick, and as it were clammy, and for that cause becomes too prone as well to boil as to stick within the narrow passages, and especially of the Lungs.
But if farther inquisition be made, from whence this disposition of blood proceeds, by which it becomes clammy and viscous like ropy wine; the general reason hereof is this, viz. that the more thick parts of blood are not made thin enough by the more sub∣tile; so that all of them being equally mixed and mutually incorporated, at length the