HUMAN BIOLOGY 



The correct position in standing is : chest forward, chin in, hips back 

 (Figs. 38, 39). To sit correctly, sit far back in the chair (Figs. 60, 

 61, 62) with the body erect and balanced. In youth the bones are soft 

 and growing ; they will readily grow into perfect shape, and will almost 

 as readily grow deformed. 



Sprains. Immerse the part in hot water for half an hour, then 

 bandage to keep the part at rest. Use the limb as little as possible. It 

 may be necessary for a physician to apply a plaster dressing to a very 

 bad sprain where the ligament is torn from the bone. 



Broken Bones. To prevent bone from cutting flesh and skin, do not 

 move the person until a temporary splint has been provided by tying 

 sticks or umbrellas around the limb with handkerchiefs. 



PRACTICAL QUESTIONS. The Skeleton. 1. What kind of a chair 

 back causes one to slide forward in the seat? 2. What fault in sitting 

 is made necessary by using a chair with so large a seat that the front 

 edge strikes the occupant behind the 

 knee? 3. Why is the shoulder more 



often dislocated than 

 the hip? 4. High pil- 

 lows may cause what 

 deformity? 5. Find 

 three bones in the 

 body not attached to 

 other bones. Find 

 twenty-five bones at- 

 tached to other bones 

 by one end only (Figs. 

 28 and 39). 6. What 

 deformities may result 

 from urging a young 

 child to stand or walk ? 

 7. Which bone is 

 most often broken by 

 falling upon the shoul- 

 der? 8. Where in 

 .bones is fat stored for 

 future use? 9. Lhja- 



FIG. 39. THE HUMAN SKELETON IN ACTION. 



ments grow very slowly. Why is recovery from a sprain often tedious? 



