SKCT. XXXIII. i. DISEASES OF SENSATION. 541 



tion, and the fyftem more rapidly weakened than 

 in irritative, fever with ftrong pulfe ; where the fpiric 

 of animation is weakened by but one mode ot" us 

 exertion : fo that this febris feniitiva pulfu forti (or 

 inflammatory fever,) may be couiideied as the febris 

 irritativa pulfu forti, with the addition of inflamma- 

 tion ; and the febris fenfitiva pulfu debili (or malig- 

 nant fever) may be confidered as the febris irritativa 

 pulfu debili (or nervous fever;, with the addition of 

 inflammation. 



4. In thefe putrid or malignant fevers a deficiency 

 of irritability accompanies the increafe of fenfibi- 

 lity ; and by this waile of fenforial power by the 

 excefs of fenfation, which was already too fmall, 

 arifes the delirium and ilupor which fo perpetually 

 attend thefe inflammatory fevers with arterial debi- 

 lity. In thefe cafes the voluntary power fir ft ceafes 

 to aft from deficiency of fenforial fpirit ; and the 

 ftimuli from external bodies have no effect on the 

 exhaufted fenforial power, and a delirium like a 

 dream is the confequence. At length the internal 

 ftimuli ceafe to excite fufficient irritation, and the 

 fecretions are either not produced at all, pr too par- 

 fimonious in quantity. Amongft thefe the fecretion 

 of the brain, or production of the fenforial power, 

 becomes deficient, till at laft all fenforial power 

 ceafes, except what is juft neceflary to. perform the 

 vital motions, and a f.upor fucceeds ; which is thus 

 owing to the fame caufe as the preceding delirium 

 exerted in a greater degree. 



This kind of delirium is owing to a fufpenfion of 

 volition, and to the difobedience of the fenfes to. ex- 

 ternal ftimuli, and is always occafio.ned by great 

 debility, or paucity of fenforial power ; it is, there- 

 fore a bad fign at the end of inflammatory fevers, 

 which had previous arterial firength, as rheumatifm, 

 or pleurify, as it (hews the prelence of great ex- 

 hauftion of fenforial power in 3 fyftem, which hav ? 



ing 



