178 MUSCULAR SYSTEM. 



the softness, and the generally light colour of the human skin. 

 The moveable parts of the face into which the muscles are 

 chiefly inserted, are the lips and the eye-Brows, from the re- 

 lation of these parts to food, to speech, and to visual impres- 

 sions ; and as the motions of those parts are regulated by 

 present sensations, and are associated with corresponding 

 conditions of the mind, they are the chief seats of human 

 expression, in which we read the transient feelings of the 

 moment, or the habitual tendency of the passions, or the in- 

 ward workings of the soul. 



