FEVERS. 627 



in many cases it may be uncertain, or not in the due proportion ; 

 and it is indeed necessary that it should be effectually executed, 

 which is to be obtained either by directing the operations of the 

 emetic to be at the same time purgative, or by its being ac- 

 companied with some purgative medicine at the same time." 



The operation of full vomiting commonly soon ceases, and 

 the exercise of vomiting is often a debilitating power ; and there- 

 fore when the vomiting does not remove the atony and spasm 

 very entirely, it may give occasion to their recurring with greater 

 force. 



CLXXIX. For these reasons, after fevers are fully formed, 

 physicians have thought proper to employ emetics in nauseat- 

 ing doses only. These are capable of exciting the action of the 

 extreme vessels, and their operation is more permanent. At 

 the same time, they often shew their power by exciting some 

 degree of sweat, and their operation is rendered more safe by 

 their commonly producing some evacuation by stool. 



CLXXX. Such are the advantages to be procured by nau- 

 seating doses of emetics ; and it only remains to mention, what 

 are the medicines most fit to be employed in that manner, 

 what are the most proper times for exhibiting, and what is the 

 best manner of administering them. 



CLXXXI. The emetics at present chiefly in use, are Ipe- 

 cacuanha and Antimony. 



The former may be employed for every purpose of emetics, 

 particularly those mentioned (CLXXIL). It may likewise 

 be employed, either in larger or smaller doses, for determining 

 to the surface of the body ; but even in very small doses, it so 

 readily excites vomiting, as to be with difficulty employed for 

 the purpose of nauseating only ; and however employed, there 

 is reason to believe that its effects are less permanent, and less 

 powerfully communicated from the stomach to the rest of the 

 system than those of antimony. 



CLXXXII. This, therefore, is generally preferred; and its 

 preparations, seemingly various, may all be referred to two 

 heads ; the one comprehending those in which the reguline part 

 is in a condition to be acted upon by acids ; and therefore on 

 meeting with acids in the stomach becomes active; and the 



