OF MANHOOD. 441 . 



pofiible for both eyes to fee the fame object at 

 the fame time. 



Next to the eyes, the parts which give moft 

 character to the countenance are the eye-brows. 

 Being totally different from every other feature, 

 their tffeOi is augmented by the contraft : They 

 form a deep fhade in the canvas, and give relief 

 to the other colours and features. The lafhes of 

 the eye-lid have alfo their effedtj when long 

 and bufhy, they beflow beauty on the eye, and 

 give a mild and pleafant afped: to the face. 

 Lafhes on both eye-lids are peculiar to man and 

 the ape. Other animals have hair on the upper 

 lid only ; and, even in man, the lafh of the under 

 lid is lefs than that of the upper. The eye-brows 

 have only two movements ; one by which 

 they are elevated ; and the other by which they 

 are depreHed and contracted. 



The eye-lids guard the ba!^of the eye from 

 duft, infeds, &c. and keep the cornea moifl. 

 The upper eye-lid moves up and down ; but 

 the under lid has little or no motion. Although 

 the motion of the eye-lids be fubjeCl to the wull, 

 yet, by flccp, fatigue, or furprife, we lofe the 

 command of them. They are fometimes alfo 

 affedlcd with convulfive motions, which we are 

 imablc to rcftrain. In birds and amphibious 

 quadrupeds, the under eye-lid alone m.oves ; 

 and fifhes and infects have no eye-lids either a- 

 bovc or below. 



The 



