fci8 



DISEASES 



Class II. i. 4. *v 



ORDO I. 



Increafed Senfation. 



GENUS IV. 



With the ProduBion of new Vejfels by internal Membranes or* 



Glands, without Fever. 



Where inflammation' is produced in a fmall part, which has 

 not great natural fenfibility, the additional fenfation does not 

 produce an increafed action of the arterial fyftem ; that is, the 

 aflbciated motions which are employed in the circulation of the 

 blood (thofe for infbance of the heart, arteries, glands, capillaries, 

 and their correfpondent veins), are not thrown into increafed ac- 

 tion by fo fmall an addition of the fenforial power of fenfation. 

 But when parts which naturally poflefs more fenfibility become 

 inflamed, the quantity of the fenforial power of fenfation becomes 

 fo much increafed, as to affect the aflbciated motions belonging 

 to the circulation, occafioning them to proceed with greater fre- 

 quency •, that is, a fever is induced. This is well exemplified 

 in the internal and fuperficial paronychia ; one of' which is at- 

 tended with great pain and fever, and the other with little pain 

 and no fever. See Clafs II. 1. 2. 19. and II. 1. 4. 5. 



From hence it appears, that the fenfitive fever is an accident- 

 al confequence of the topical phlegmon, or inflammation, and 

 not a caufe of it ; that it is often injurious, but never falutary ; 

 and fhould therefore always be extinguished, as foon as may be, 

 either by the lancet and cathartics, and diluents, and cold air, 

 when it is of the irritated kind ; or by the bark, opium, cool air, 

 and nutrientia, when it is of the inirritated kind. 



SPECIES. 



1. Ophthalmia fuperficialis . As the membranes, which cover 

 the eye, are excluded from the air about one third part of the 

 twenty-four hours, and are moiftened by perpetual nictitation 

 during the other fixteen, they may be confidered as internal 

 membranes ; and, from the analogy of their inflammation to 

 that of other internal membranes, it is arranged under this ge- 

 nus •, whiift the tonfillitis is efteemed an inflammation of an ex- 

 ternal membrane, becaufe currents of air are perpetually pafling 

 both day and night over the fauces. 



The fuperficial ophthalmy has generally been efteemed a 



fymptom 



