4S4 DISEASES OF SENSATION. SECT. XXXIII. a, 



2. Thus the pleafurable fenfations produce an 

 enlargement of the nipples of nurfes, of the papillse 

 of the tongue, of the penis, and probably produce 

 the growth of the body from its embryon ftate to 

 its maturity ; whilft the new motions in confequence 

 of painful fenfation, with the growth of the fibres 

 or veflels, which they occafion, are termed inflamma- 

 tion. 



Hence when the flraight mufcles are inflamed, 

 part of their tendons at each extremity gain new life 

 and fenfibility, and thus the mufcle is for a time 

 elongated ; and inflamed bones become foft, vafcu- 

 lar, and fenfible. Thus new veflels (hoot over the 

 cornea of inflamed eyes, and into fchirrhous tu- 

 mours, when they become inflamed ; and hence all 

 inflamed parts grow together by intermixture, and 

 inofculation of the new and old veflels. 



The heat is occaiioned from the increafed fecre- 

 tions either of mucus, or of the fibres, which pro- 

 duce or elongate the veflels. The red colour is 

 owing to the pellucidity of the newly formed veflels, 

 and as the arterial parts of them are probably form- 

 ed before their correfpondent venous parts. 



3* Thefe new motions are excited either from 

 the increafed quantity of fenfation in confequence 

 of greater fibrous contractions, or from increafed 

 feniibility, that is, from the increafed quantity of 

 fenforial power in the moving organ. Hence they 

 are induced by great external ftimuli, as by wounds, 

 broken bones, and by acrid or infectious materials, 

 or by common ilimulion thofe organs, which have 

 been fome time quiefcein ; as the ufual light of 

 the day inflames the eyes of thofe, who have been 

 confined in dungeons ; and the w T arrnth of a com- 

 mon fire inflames thofe, who have been previoufly 

 expofed to much cold. 



But thefe new motions are never generated by 

 that pain, which arifes from defect of ftirnulus, as 



from 



