Thus it comes to pass by the wonderful Sagacity of Nature, such extraordinary Provision is made, that the purer part of the Chyle by these ways and means is more purified; and when it is thus purified and sublimed, it is more capable of reinforcing the Blood and Spirits, as also of corroborating the Tone of every particular Part: Whereas when the Chyle is sour and dispirited, the Blood necessarily becomes vappid, the animal Spirits which reside in the System of the Nerves are infected with a Morbid Disposition, and all parts of the Body begin to flag and waste. For indeed there is no other way to recruit the daily Expence of Blood and Spirits, but by a continual Influx of laudable Chyle into the Blood-Vessels, which Chyle is made by the Fermentative Juice of the Stomach, and this Fermentative Juice supplied from the Mass of Blood, so that there plainly appears to be a fixed Correspondence betwixt the Blood and the Chyle, and a necessary Dependance all the Humours in the Habit of the Body have on the Stomach; from whence it is reasonable to infer, That if the Chilifying Faculty of the Stomach be depraved, the Blood and Humours must necessarily sympathize therewith, and in a manner proportionable to the Distemper of this part. II. The immediate Cause of a _Consumption_ of the _Lungs_ is store of sharp, malignant, waterish Humours, continually distilling upon the soft spungy Substance of the Lungs, stuffing, inflaming, impostumating, and exulcerating them, whereby their Action, which is Respiration, or a receiving-in and driving-out Air is depraved, as will more clearly appear by the following Description of these Parts. It will not be impertinent to our Discourse if we should usher in the Description of the _Lungs_, with a short Account of the _Trachea_, _Aspera Arteria_, or _Wind-pipe_. III. The _Trachea_ or _Aspera Arteria_ is a long Pipe, consisting of Cartilages and Membranes, which beginning at the Throat or lower part of the Jaws, and lying upon the Gullet, descends into the _Lungs_, thro’ which it spreads into many Branchings, and is commonly divided into two parts, the _Larynx_ and _Bronchus_; the _Larynx_ is the upper part of the Wind-pipe, the _Bronchus_ is all the _Trachea_ besides the _Larynx_, as well before as after it arrives at the _Lungs_.