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



Tract 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- 

 jecr. to palenefs of their (kins, on coming into a temperature of 

 30 or 40 degrees ; which would produce great palenefs and 

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

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

 gous to this, an obferving friend of mine aflured m :,'■ that once 

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

 nious and humorous companions, and drunk a confiderabie 

 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 foon 

 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 Sect. XXXIV. 2. 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 vefTels, 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 remiffions and 

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

 the evening, when the folar gravitation is the leaft, 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 termedSfebris fenfitiva ir- 

 ritata, or pyrexia, or inflammation ; if with a weak pulfe, 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 vetfels, as they harden, like the fiik of 

 the fi Ik- worm. See Art. 15. of this Supplement. 



VI. Circles $f irritative Ajjbciate Jl ] lotions. 



1. There are fome afiS .ions, which are perpetually 



proce".:!::^ 



