CHAPTER VIII. 



THE PIGEOK. 



1. Identify the head, beak, and upper and lower 

 mandibles. Can the upper mandible move without 

 moving the skull ? 



2. Find the nostrils. Insert the head of a pin 

 into the nostrils, to see where they open into the 

 mouth. 



3. Observe the swollen membrane, beneath which 

 the nostrils open on the outside. 



4. Find the tongue and notice its peculiarities. 

 At the base of the tongue, notice an opening into the 

 windpipe. It is the glottis. 



5. See the eyes. How many eyelids do you 

 find? The transparent one is the nictitating mem- 

 brane. In what direction does it move? What is 

 its use? Is there anything homologous to it in your 

 own eye? 



6. Find the ears. What peculiarity of the feathers 

 around the ear? Draw the head. 



The Liegs. 



1. The segment of the leg next to the body is the 

 thigh. Its bone is the femur. 



2. The bone of the leg, or drumstick, is the tibia. 



3. The next part of the leg is the tarsus. Is it 

 feathered? Which joint corresponds to the knee? 

 Does a knee ever bend backward? 



4. How many toes on each foot? How arranged? 



104 



