4 THE SUN, STARS, AND PLANETS 



line with the North Star, because if a line were drawn 

 from one stick to the other, and then extended far enough 

 it would pass to the North Star. A string stretched be- 

 tween the two sticks forms a line which points north. 



Review Questions, 1. 



1. When did the sun rise this morning? 



2. How can you tell the time of sunrise by the 

 time of sunset? 



3. Why are books valuable? 



4. What is an experiment? 



5. What are some of the advantages of performing 

 experiments? 



6. When should we use books and when should 

 we experiment? 



7. How do those who write books learn what to 

 write? 



8. How do we direct persons from one place to an- 

 other, in a city? 



9. What must we do in the open country, or on the 

 ocean, to know in what direction we are going? 



10. Why did you drive two sticks in the ground to 

 make a line pointing north? Could you have done it 

 with one stick? 



Experiment 2. *The Movement of the Great Dip- 

 per. 



Apparatus: Rule, scissors, dividers. 



Materials: Cardboard 6"xl2", paper fastener, or 

 pin and piece of cork. 



* See Section 62 before performing this experiment 



J 



