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CHAP. LXXIII. Of the Iliack Passion.
THis dreadful Disease being hitherto almost in the Opi∣nion of all Mortal, takes its Rise from the inverted and preposterous Motion of the Intestines, to wit, the Fi∣bres of the Intestines, which ought to be contracted from the Superior toward the Inferior, are drawn to the Superi∣or; and whatsoever is contained in the Intestines, is not protruded to the Belly, but towards the Stomach, and is violently regurgitated to the Mouth, so that Glisters, how sharp soever become vomitive; and also Catharticks taken by the Mouth are suddenly cast up by Vomit. And in my Opinion, the exquisite and intollerable Pain coming upon this Disease, is only occasioned by the foresaid preposterous Motion of the Intestines; for whereas those Folds, which the many Circumvolutions of the Intestines make, are so formed by Nature, that they should most fitly conduce to the carrying down of the Faeces: When they, I say, are forced to give way to a Motion contrary to their Fibres, the aforesaid Pain is occasioned from thence, which is fixed to one part, and is like the boreing of an Auger, when either the Valve, which is placed at the Beginning of the Colon, hinders the going back of the Excrements to the Ilion, or any other Membrane belonging to the Sinus sustains alone the Force of this preposterous Impulse.
We may assign a twofold Cause of this Inversion, from whence the Pain arises, viz. Obstruction and Iritation.
First therefore, Whatever violently obstructs the Inte∣stines, so that nothing can pass downwards, necessarily pro∣duces this contrary Motion in them. Among these Authors are wont to reckon the Excrements hardened, gross Wind collected in a great quantity, and tying up as it were the Intestines, the Constriction of them in a Rupture: And lastly An Inflammation, and other great Tumours, which stop up the Internal Cavity of the Intestine. In the mean time we must not deny, that this contrary Motion, owing its