9. Time. 



a. Sun time or local time. 



Experiment 9. The real noon. 



b. Standard time. 



10. The seasons. 



Experiment 10. Area covered by unit 



area of sunshine. 

 Experiment 11. The cause of seasons. 



11. The changing length of day and night. 



Experiment 12. The cause of the chang- 

 ing length of day and night. 



12. The story of the calendar. 



(These subjects, The Sun, Stars, and Planets, 

 are continued in the work for the seventh 

 grade.) 



LIGHT. VI. 



13. A brief summary of the facts stated under the 



same topic in the work for the fifth grade. 



14. Light passes through some objects easily. 



Experiment 13. Transparent objects 

 the "burning glass." 



15. Light passes through some object with difficulty. 



Experiment 14. Translucent objects. 



16. Diffused light. (See Section 90.) 



a. Best for the eyes. 



b. Why the sun seems largest at sunrise and 

 sunset. 



17. Reflection of light. 



a. Images in a mirror. 



Experiment 15. The location of images 

 in a mirror. 



b. The direction of reflected light. 



Experiment 16. The aucgle- of reflection 



