24 FIBROUS CONTRACTIONS. SECT. VI. 2.2. 



fibrous motions ; it is termed irritation, and irritative motions 

 are thofe contractions of the mufcular fibres, or of the organs 

 of fenfe, that are immediately confequent to this exertion or 

 change of the fenforium. 



2. Senfitive motions. That exertion or change of the fenfo- 

 tium, which conftitutes pleafure or pain, either fimply fubfides, 

 or is fucceeded by volition, or it produces fibrous motions ; it 

 is termed ienfation, and the fenfitive motions are thofe contrao 

 tions of the mufcular fibres, or of the organs of fenfe, that arc 

 immediately confequent to this exertion or change of the fenfo- 

 rium. 



3. Voluntary motions. That exertion or change of the fen- 

 forium, which conftitutes defire or averfion, either fimply fub- 

 fides, or is fucceeded by fibrous motions ; it is then termed vo- 

 lition, and voluntary motions are thofe contractions of the muf- 

 cular fibres, or of the organs of fenfe, that are immediately con- 

 fequent to this exertion or change of the fenforium. 



4. Aflbciate motions. That exertion or change of the fen- 

 forium, which accompanies fibrous motions, either fimply fub- 

 fides, or is fucceeded by fenfation or volition, or it produces 

 other fibrous motions ; it is then termed aflbciation, and the af- 

 fociate motions are thofe contra 'ions of the mufcular fibres, or 

 of the organs of fenfe, that are immediately confequent to this 

 exertion or change of the fenforiurq,. 



SECT 



