





THE FRAMEWORK OF TIJE BODY. 23 



14. The Repair of Bone. Nature's provision for 

 uniting broken bones is very complete. At first, blood is 

 poured out around the ends of the bone, as a result of 

 the injury. This is gradually absorbed, and gives place 

 to a watery fluid, which, thickening from day to day, ac- 

 quires, at the end of two weeks, the consistency of jelly. 

 This begins to harden, by a deposit of new bone-substance, 

 until, at the expiration of five or six weeks, the broken 

 bone may be said to be united. It is, however, still fragile, 

 and must be used carefully a few weeks longer. The 

 process of hardening continues, and months must pass 

 before the union can be said to be complete. 



QUESTIONS FOR TOPICAL REVIEW. 



PAGE 



1. What useful purposes do the bones serve ? 15, 16 



2. State what you can of the composition of the bones 16 



3. Of the usefulness of lime in the bones 16 



4. Of the usefulness of animal substance in the bones 16 



5. State what you can of the structure of the bones 17 



6. Of the strength belonging to the bones '. 15. 16, 17 



7. What is meant by the human skeleton ? 19 



8. Give a description of its construction 19 



9. What is meant by a joint in the human frame ? 19 



10. State what you can of the movable joints 19, 20 



11. What office is performed by the ligaments of the joints ? 19, 20 



12. What by the cartilage at the joints ? 20 



13. What movable joints are there ? 20, 21 



14. Describe the construction of the spinal column 21 



15. What properties and powers does the spinal column possess ? 21, 22 



16. When is a person taller than at other times ? . . 22 



17. Give the reason for this 22 



18. What can you state of the growth of bone ? 22 



f 19. Describe the process by which a broken bone is repaired 23 



M ' Jr' w ft si 





