244 EXPERIMENTAL GENERAL SCIENCE 



14. In the lower or pelvic girdle, there are two bones called the pelvic 

 or hip bones. How many bones in the pectoral girdle (at the shoulder) ? 



16. What appendages in the bird correspond to the human arm? 



16. How do the bones in the arm and forearm compare in number with 

 the bones in the corresponding parts of a bird? 



17. What vertebrate animals lack an appendicular skeleton? 



18. Which has the greater freedom of motion, the thumb or the great 

 toe? 



19. Of what advantage is this? 



20. Examine the arm and forearm and locate the muscles that open 

 and close the hand. 



21. Where are the tendons located that transmit this motion? 



22. Why are the bones of the lower extremities larger than those of the 

 upper? 



23. Which are larger, the vertebrae near the head or those near the 

 hips? Why? 



24. Why may large pillows be injurious? 



25. The muscles on the breast of a pigeon are dark and those on the 

 breast of a chicken are light. Why? 



26. Why does merely standing up become tiresome? 



27. Which is less tiresome, a long walk in hilly country or the same 

 distance on a level? Why? 



