THE PIGEON. 



Ill 



4. Observe a thin membrane, the vitelline mem- 

 brane, around the yolk. 



5. Notice two twisted strings, the chalazse, run- 

 ning from the vitelline membrane in the white. 



6. In the yolk, notice the nucleus. Does it extend 

 clear through? 



7. In the nucleus, see the nucleolus. 



Make a table showing differences between a pigeon 

 and a fish, thus : — 



Fish, 



Pigeon. 



Covering. . . . 

 Appendages., 



Habitat 



Locomotion, . , 



Heart 



Circulation . , , 

 Breathing. . . . 

 Temperature . 

 Eggs 



Review Questions on the Pigeon. 



1. What is the beak? 



2. Of what is the beak composed? 



3. How does the mouth open? 



4. What is peculiar about the tongue? 



5. Where are the nostrils? 



6. Into what do the nostrils open ? 



7. What and where is the glottis? 



8. How many eyelids? 



9. Where is the third eyelid fastened? 



10. What is there in our eyes that is homologous 



to the third eyelid? 



11. Where are the ears? 



12. What is peculiar about the feathers around the ears ? 



