56 



EYE. 



want of the eye generate the gland which produces 

 the tear, or bore the hole by which it is discharged, 

 — a hole through a bone ! " 



Fig. S. 



o, the lachrymal gland, the source of the tears, b, the channels 

 or ducts which lead the tears from the lachrymal gland into 

 the eye. c , c, the puncta lachrymalia, or tear holes, which 

 conduct the tears into the outlet or lachrymal sac, by which 

 they are discharged into the nostril. It will here be noticed 

 that the reservoir precisely resembles the eye, not only as to 

 having an outlet, but as to the fountain being in both cases 

 e evated above the place of reception. Owing to this circum- 

 s ance, the tears more readily enter the eye. It will also be 

 observed, that in each instance the source is at one corner 

 and the outlet at the opposite. This is evidently beneficial to 

 he eye; thereby the tears must pass the entire length of 



dthaT^/ 1UbriCate ^ Wh ° le SUrfkCe ' b6f0re the * «• 



Are there any other respects in which we discover 

 intentional contrivance for the security of the eye ? 



th w 1S ^^ ^ a stron §> b ^y socket, called 

 the orbit, composed of several bones, the upper of 



