SUP. 1. 5. 2. THEORY OF FEVER. 455 



Trafc on Simple fever, page 168. He aflerts, that thofe people* 

 who have been confined fome time in a very warm atmofphere, 

 as of 120 or 130 degrees of heat,. do not feel cold, nor are fub- 

 jeft to palenefs of their fkins, on coming into a temperature of 

 30 or 40 degrees ; which would produce great palenefs and 

 painful fenfation of coldnefs in thole, who had been fome time 

 confined in an atmofphere of only 86 or 90 degrees. Analo- 

 gous to this, an obferving friend of mine allured me, that once 

 having fat up to a very late hour with three or four very inge- 

 nious and humorous companions, and drunk a confiderable 

 quantity of wine ; both contrary to his ufual habits of life ; and 

 being obliged to rife early, and to ride a long journey on the 

 next day ; he expected to have found himfelf weak and fopn 

 fatigued ; but on the contrary he performed his journey with 

 unufual eafe and alacrity ; and frequently laughed, as he rode, 

 at the wit of the preceding evening. In both thefe cafes a de- 

 gree of pain or pleafure actuated the fyftem , and thus a fenfo- 

 rial power, that of fenfation, was fuperadded to that of irrita- 

 tion, or volition. See Seel. XXXIV. ^. 6. 



2. Similar to this, when the energetic exertions of fome parts 

 of the fyftem in the hot fit of fever arife to a certain excefs, a 

 degree of fenfation is produced ; as of heat which particularly 

 increafes the actions of the cutaneous velTels, which are more 

 liable to be excited by this ftimulus. When this additional fen- 

 forial power of fenfation exifts to a greater degree, the pulfe, 

 which was before full, now becomes hard, owing to the inflam- 

 mation of the vafa vaforum, or coats of the arteries. In thefe cafes 

 whether there is any topical inflammation or not, the fever ceaf- 

 es to intermit ; but neverthelefs there are daily remiflions and 

 exacerbations of it ; which recur for the moft part about fix in 

 the evening, when the folar gravitation is the leait, as mention- 

 ed in Sea. XXXVI. 3. 7. 



3. Thus the introduction of another fenforial power, that of 

 fenfation, converts an intermittent fever into a continued one. 

 If it be attended with ftrong^ pulfe, it is termedjfebris fenfuiva ir- 

 litata, or pyrexia, or inflammation ; if with a weak pulie, is is 

 termed febris fenfitiva inirritata, or typhus gravior, or malignant 

 fever. The feat of the inflammation is in the glandular or capil- 

 lary fyftem, as it confifts in the fecretion of new fluids, or new 

 fibres, which form new vclTels, as they harden, like the iilk of 

 the filk-worm. See Art. 15. of this Supplement. 



VI. Circles of irritative Ajficiaic 

 J. There are fome aflbciate motions, \vht~h are perjlKualiy 



