THE EYE. 147 



in the front of the eye ; then cut clear around the eye 

 and remove a strip of this width, thus enlarging the 

 opening before made. On the inside of the strip 

 removed there may be found radiating black ridges, 

 the ciliary processes. Note part of these ciliary 

 processes around the margin of the lens capsule. 

 9. Carefully pick away with the forceps and snip away 

 with the scissors everything on the surface of the 

 clear mass beneath. 



10. The substance filling the remainder of the eye-cavity 

 is the vitreous humor. 



11. Through the vitreous humor the entrance of the optic 

 nerve may be seen with the blood-vessels radiating 

 from it. 



12. The tough outer coat of the eye is the sclerotic coat. 



13. Inside the sclerotic is the dark choroid coat. 



14. The inner, nearly transparent coat is the retina. 



15. Drag out the vitreous humor and note the soft whit- 

 ish retina ; observe that it is a continuation of the 

 optic nerve. Tear away the retina, noting its con- 

 sistency. Note the color and luster of the inner sur- 

 face of the choroid coat. 



The reflection of light from this surface of the 

 choroid coat causes the color seen in the eyes of some 

 animals. Turn the remaining coats inside out and 

 tear the choroid coat from the sclerotic. Observe the 

 blood-vessels passing from one to the other. 



THE LARYNX OF THE CALF. 



1. The front of the larynx is readily distinguished by the 

 projection of cartilage known as the Adam's apple. 



