SECT. I. CHAP. VI. Of a Phthisis properly so called, or of a Consumption arising by fault of the Lungs.
A Consumption doth so frequently and usually proceed from the Lungs being de∣praved, that some have termed it the peculiar Disease of this Bowel: and that it very often so comes to pass, the reason is; because (as we have shewed before) the pining of the body doth for the most part more immediately proceed from the blood depraved and unapt for nourishment, it is manifest, that as its perfection is acquired in the Lungs, so from these being ill-affected the same is most of all vitiated, and degenerates into a languishing and corruptible state. For in the Lungs rather than in the Heart or Brain, the threads of life are spun, and there they are oftnest defiled or broken.
A Phthisis is usually defined to be A pining away of the whole body, taking its rise * 1.1 from an Ulcer in the Lungs. But less true: because I have opened the dead bodies of many that have died of this disease, in whom the Lungs were free from any Ulcer, yet they were set about with little swellings, or stones, or sandy matter throughout the whole: for from thence the blood, because it could neither be freely circulated in the Praecordium, nor animated enough by the nitrous air, and when in the mean time it is perpetually polluted by its proper dregs deposited in the Lungs, is frequently vi∣tiated and made incapable of nourishing thereby: wherefore a Phthisis is better de∣fined, That it is a withering away of the whole body arising from an ill formation of the Lungs.
The Ancients following Hippocrates, for the most part have assigned only two causes * 1.2 of this disease, viz. a Catarrk, and the breaking of a Vein, to which some have added an Empyema: and others exclude a Catarrh from this number: for what is vulgarly affirm∣ed, that flegm falling from the Head into the Lungs, and abiding there putrifies, is most commonly the cause of a Phthisis, or is often brought by it, we have formerly intima∣ted to be altogether erroneous, and shall presently shew it more clearly. In the mean time to shew what the matter is that generates a Consumption as often as it arises with∣out * 1.3 an Empyema or Haemoptoe going before, it must be considered after how many manners and by what ways any thing disagreeable or Heterogene can enter into the Lungs; which diligent search being made, it will easily appear, that any thing that is an enemy to the Lungs creeps in and is admitted chiefly either by the Trachea or by * 1.4 the Pneumonic Arteries, yea and sometimes haply by the Nerves, but nothing by the Veins or Lympheducts, whose function is only to carry back or away the blood or Lympha, d•…•… to leave there nothing at all.
As to the Trachea, it is manifest it is ordained for this end, that by its passages or pipes the air might be conveyed in or presently c•…•…rried back by a constant recourse from whence it comes; moreover, whether any matter being hurtful or mortal to the * 1.5 Praecordia may be admitted the same way, shall be now our present disquisition. And that the Lungs frequently incur a pernicious pollution by this entrance is clear from