34 SENSORIAL FACULTIES. Sicr.V. 



SECT. V. 



OF THE FOUR FACULTIES OR MOTIONS OF THE SEN- 

 SORIUM. 



I. Four fenforial powers. 2. Irritation, fenfatlon^ vo- 

 lition, ajjoclation defined. 3. Senforial motions dif- 

 tlnguijhed from fibrous motions. 



1. THE fpirit of animation has four different 

 modes of action, or in other words the animal fen- 

 forium poffeffes four different faculties, which are 

 occaiionally exerted, and caufe all the contractions 

 of the fibrous parts of the body, Thefe are the 

 faculty of caufing fibrous contractions in confe- 

 quence of the irritations excited by external bodies, 

 in confequence of the fenfationsof pleafure or pain, 

 in confequence of volition, and in confequence of 

 the affociations of fibrous contractions with other 

 fibrous contractions, which precede or accompany 

 them. 



Thefe four faculties of the fenforium during their 

 inactive (late are termed irritability, fenfibility, vo- 

 luntarity, and affectability ; in their active flate 

 they are termed as above, irritation, fenfation, vo- 

 lition, afibciation. 



2. IRRITATION is an exertion or change of fome 

 extreme part of the fenforium reading in the muf- 

 cles or organs of fenfe, in confequence of the ap- 

 pulfes of external bodies. 



SENSATION is a,n exertion or change of the cen- 

 tral parts of the fenforium, or of the whole of it, 

 beginning at fome of thofe extreme parts of it, 

 which refide in the mufcles or organs of fenfe. 



VOLITION 



