_The Omission of this Chapter was a very material Defect in the original Plan of this Work. The Editor of it at Paris was very sensible of this Chasm, or Blank, as it may be called, and has filled it up very properly: and if I have not made Use of his Supplement, instead of enlarging myself upon the Articles of which he has treated, it has only been from a Purpose of rendering the whole Work more uniform; and to avoid that odd Diversity, which seems scarcely to be avoided in a Treatise composed by two Persons. Besides which, that Gentleman has said nothing of the Articles, which employ the greatest Part of that Chapter, *viz.* the Swoonings, the Consequences of great Fear, and the noxious Vapours._ _Before I conclude, I ought to justify myself, as well as possible, to a great Number of very respectable Persons both here and abroad, (to whom I can refuse nothing without great Chagrine and Reluctance) for my not having made such Additions as they desired of me. This however was impossible, as the Objects, in which they concurred, were some chronical Distempers, that are entirely out of the Plan, to which I was strictly attached, for many Reasons. The first is, that it was my original Purpose to oppose the Errors incurred in Country Places, in the Treatment of acute Diseases; and to display the best Method of conducting such, as do not admit of waiting for the Arrival of distant Succour; or of removing the Patients to Cities, or large Towns. It is but too true indeed, that chronical Diseases are also liable to improper Treatment in small Country Places: but then there are both Time and Convenience to convey the Patients within the Reach of better Advice; or for procuring them the Attendance of the best Advisers, at their own Places of Residence. Besides which, such Distempers are considerably less common than those to which I had restrained my Views: and they will become still less frequent, whenever acute Diseases, of which they are frequently the Consequences, shall be more rationally and safely conducted._