202 



THE SPECIAL SENSES. 



this small "lachrymal point'' may be seen in your own 

 eye. In old people, these points become everted, and do 

 not conduct the tears to the nasal cavity, so that they are 

 inconvenienced by an overflow of tears upon the face. 



58. Thus we observe that the gland which forms the 

 tears is placed rt the outer part of the eye, while their 

 means of exit is at the inner angle of the eye; which fact 

 renders it necessary that this watery fluid shall pass over 

 the surface of the eyeball before it can escape. This ar- 



FIG. 48. VERTICAL SECTION OF THE EYE. (Enlarged.) 



C, The Cornea. 



A, The Aqueous Humor. 

 I. The Iris*. 



P, The Pupil. 



L, The Crystalline Lens. ' 



H, The Ligament of the Lens. 



B, The Ciliary Process. 



V, The Cavity containing the Vit- 

 reous Humor. 

 S, The Sclerotic. 



Ch, The Choroicl. 



R, The Retina. 



N. The Optic Nerve. 



DD. The Eyelids. 



X, The Levator Muscle of the Upper 



Lid. 

 Y, The Upper Straight Muscle of the 



Eye. 

 Z, The Lower Straight Muscle. 



rangement cannot be accidental, but evinces design, for it 

 thus secures the perfect lubrication of the surface of the 

 eve, and cleanses it from the smaller particles of dust 



58. The watery fluid passing over the eyeball ? Design of the arrangement ? 

 Winking ? 



