FROG. Ill 



small nerves to the muscles and skin of 

 the body -wall. 



Diagram of the sympathetic ganglia and their 

 principal nerves, and of the spinal nerves 

 of one side. 



VII. The Eye. 



With fine scissors make an incision in the skin 

 above the eyeball. Continue this cut around 

 the edge of the socket. Lifting the eyeball 

 by the edge of the skin, cut it free from the 

 muscles and nerve beneath. Take out both 

 eyes and harden them for two or three days 

 in formic aldehyde solution. 

 Divide one eye into right and left halves, 



and one into proximal and distal halves. 

 Observe : 



1. The sclera. 4. The retina. 



2. The cornea. 5., The lens. 



3. The choroid coat. 6. The vitreous humor. 



VIII. Muscles. 



Cut through the skin around the junction of 

 the leg with the body, and strip the skin 

 from the leg. 



Bend the leg, and try to distinguish the 

 flexors and extensors. Dissect the leg 

 to show the sartorius and gastrocnemius 

 muscles. (See diagram.)* 



* Enlarged from Figs. 80 and 81, Ecker's "Anatomy of the 

 Frog," translated by G. Haslam. Clarendon Press, 1889. 



