21 8 DISEASES CLASS It. I. 4; 1 , 



ORDO I. 



Increased Sensation. 

 GENUS IV. 



With the production of new Vessels by internal Membranes or 

 Glands, without Fever. 



WHERE inflammation is produced in a small part, which has 

 not great natural sensibility, the additional sensation does not 

 produce an increased action of the arterial system ; that is, the 

 associated motions which are employed in the circulation of the 

 blood (those for instance of the heart, arteries, glands, capillaries, 

 and their correspondent veins) are not thrown into increased ac- 

 tion by so small an addition of the sensorial power of sensation. 

 But when parts which naturally possess more sensibility become 

 inflamed, the quantity of the sensorial power of sensation becomes 

 so much increased, as to affect the associated motions belonging 

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

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

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

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

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



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

 al consequence of the topical phlegmon, or inflammation, and 

 not a cause of it; that it is often injurious, but never salutary; 

 and should therefore always be extinguished, as soon 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 nutrigitia, when it is of the inirritated kind. 



SPECIES. 



1. Ophthalmia superficialis. As the membranes, which cover 

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

 twenty-four hours, and are moistened by perpetual nictitation 

 during the other sixteen, they may be considered as internal 

 membranes; and from the analogy of their inflammation to 

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

 nus; whilst the tonsillitis is esteemed an inflammation of an ex- 

 ternal membrane, because currents of air are perpetually passing 

 both day and night over the fauces. 



The superficial ophthalmy has generally been esteemed a 



