THE RABBIT. 127 



4. In what direction do the ears point? 



5. How many toes on the hind foot? On the front 



foot? 



6. What is peculiar about the soles of the feet? 



7. What peculiarity has the upper lip? 



8. Is thel-e a third eyelid? 



9. How many incisors in the lower jaw? 



10. How many incisors in the upper jaw? How are 



they arranged? 



11. How many molars in the right side of the upper 



jaw? 



12. How many in the right side of the lower jaw? 



13. Of what use are the whiskers? 



14. What two cavities in the body? What separates 



them? 



15. What organs are found in the abdominal cavity? 



16. What are the digestive organs? 



17. What is the mesentery? 



18. What organs are in the thoracic cavity? 



19. Trace the aorta, naming all branches you have seen. 



20. From what part of the heart does the aorta spring? 



21. In what direction does the aorta bend? 



22. What veins carry the blood back to the heart? 



23. Name the branches which make up each vena cava. 



24. What part of the heart do the venae cavse enter? 



25. What artery carries blood to the lungs? 



26. From what part of the heart does it spring? 



27. What veins bring blood back to the lungs? 



28. How many pulmonary veins enter the heart? 



29. Name all the parts of the heart. 



30. What is the pericardium ? 



31. How many lungs? What is their function? 



32. What muscles are used in breathing? 



33. What tube carries air to the lungs? 



34. How many rings in the trachea? 



35. Of what are the rings composed? 



36. Do the rings go entirely around? 



