22 SENSORIAL FACULTIES. SECT. V. 3. 



or organs of fenfe, are probably fimple contractions j the fibres 

 being again elongated by antagonift mufcles, by circulating 

 fluids, or fometimes by elaftic ligaments, as in the necks of 

 quadrupeds. The fenforial motions, which conftitute the fen- 

 fations of pleafure or pain, and which conftitute volition, and 

 which caufe the fibrous contractions in confequence of irritation 

 or of aflbciation, are not here fuppofed to be fluctuations or re- 

 fluctuations of the fpirit of animation ; nor are they fuppofed 

 to be vibrations or re vibrations, nor condenfations or equilibra- 

 tions of it ; but to be changes or motions of it peculiar to life. 



SECT. 



