Sec. 426. It has been shewn already, that Substances obstructing the Passage of the Gullet sometimes suffocate the Patient; that at other Times they can neither be extracted nor thrust down; but that they stop in the Passage, without killing the Patient, at least not immediately and at once. This is the Case when they are so circumstanced, as not to compress the _Trachaea_, the Wind-pipe, and not totally to prevent the swallowing of Food; which last Circumstance can scarcely happen, except the Obstruction has been formed by angular or pointed Bodies. The Stoppage of such Bodies is sometimes attended, and that without much Violence, with a small Suppuration, which loosens them; and then they are either returned upwards through the Mouth, or descend into the Stomach. But at other Times an extraordinary Inflammation is produced, which kills the Patient. Or if the Contents of the Abscess attending the Inflammation tend outwardly, a Tumour is formed on the external Part of the Neck, which is to be opened, and through whose Orifice the obstructing Body is discharged. In other Instances again they take a different Course, attended with little or no Pain, and are at length discharged by a Gathering behind the Neck, on the Breast, the Shoulder, or various other Parts. Sec. 427. Some Persons, astonished at the extraordinary Course and Progression of such Substances, which, from their Size, and especially from their Shape, seem to them incapable of being introduced into, and in some Sort, circulating through the human Body, without destroying it, are very desirous of having the Rout and Progression of such intruding Substances explained to them. To gratify such Inquirers, I may be indulged in a short Digression, which perhaps is the less foreign to my Plan; as in dissipating what seems marvelous, and has been thought supernatural in such Cases, I may demolish that superstitious Prejudice, which has often ascribed Effects of this Sort to Witchcraft; but which admit of an easy Explanation. This very Reason is the Motive that has determined me to give a further Extent to this Chapter. Wherever an Incision is made through the Skin, a certain Membrane appears, which consists of two Coats or _Laminae_, separated from each other by small Cells or Cavities, which all communicate together; and which are furnished, more or less, with Fat. There is not any Fat throughout the human Body, which is not inclosed in, or enveloped with, this Coat, which is called the adipose, fatty, or cellular Membrane.