Sec. 26. I must also take Notice of another dangerous common Practice; which is that of purging, or vomiting a Patient, at the very Beginning of a Distemper. Infinite Mischiefs are occasioned by it. There are some Cases indeed, in which evacuating Medicines, at the Beginning of a Disease, are convenient and even necessary. Such Cases shall be particularly mentioned in some other Chapters: but as long as we are unacquainted with them, it should be considered as a general Rule, that they are hurtful at the Beginning; this being true very often; and always, when the Diseases are strictly inflammatory. Sec. 27. It is hoped by their Assistance, at that Time, to remove the Load and Oppression of the Stomach, the Cause of a Disposition to vomit, of a dry Mouth, of Thirst, and of much Uneasiness; and to lessen the Leaven or Ferment of the Fever. But in this Hope they are very often deceived; since the Causes of these Symptoms are seldom of a Nature to yield to these Evacuations. By the extraordinary Viscidity or Thickness of the Humours, that foul the Tongue, we should form our Notions of those, which line the Stomach and the Bowels. It may be washed, gargled and even scraped to very little good Purpose. It does not happen, until the Patient has drank for many Days, and the Heat, the Fever and the great Siziness of the Humours are abated, that this Filth can he thoroughly removed, which by Degrees separates of itself. The State of the Stomach being conformable to that of the Tongue, no Method can effectually scour and clean it at the Beginning: but by giving refreshing and diluting Remedies plentifully, it gradually frees itself; and the Propensity to vomit, with its other Effects and Uneasinesses, go off naturally, and without Purges. Sec. 28. Neither are these Evacuations only negatively wrong, merely from doing no Good; for considerable Evil positively ensues from the Application of those acrid irritating Medicines, which increase the Pain and Inflammation; drawing the Humours upon those Parts that were already overloaded with them; which by no means expel the Cause of the Disease, that not being at this time fitted for Expulsion, as not sufficiently concocted or ripe: and yet which, at the same Time, discharge the thinnest Part of the Blood, whence the Remainder becomes more thick; in short which carry off the useful, and leave the hurtful Humours behind.