CHAPTER VII. 



THE FROG. 



1. Find the eyes, nostrils, mouth. Has the frog a 

 neck? How many eyelids? 



2. Find the ears. Notice tlie white- spot in the 

 center. 



3. Has the frog teeth? If so, where? Examine 

 the tongue. "Where attached? Is it forked or not? 

 Of what use is the tongue? 



4. Study the legs. How do the fore and hind legs 

 differ? How many toes on each? 



5. The parts of the fore leg are arm, forearm, and 

 hand.^ 



6. The parts of the hind leg are thigh, leg, and foot. 



7. Notice the color and texture of the skin. 



Internal Structure. 



1. Remove the skin from the ventral side and cut 

 through the body Avail. Is there any diaphragm? 



2. Identify the liver, stomach, intestine, heart, and 

 lungs. 



3. Beginning at the stomach, trace the intestine 

 its entire length. 



4. Notice the mesentery, which holds the intestine 

 in place. In the mesentery, near the stomach, find 

 the pancreas. 



5. How many lobes has the liver? Find the 

 bile sac. 



6. In the mesentery, posteriorly, find the spleen. 



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