Ihe divisions of the subject matter are as follows: 



1. The Sun, Stars and Planets V. VI. VII. VIII. 



2. Light V. VI. VII. VIII. 



3. Heat V. VI. VII. VIII. 



4. Air V. VI. VII. VIII. 



5. Water V. VI. VII. VIIL 



6. Plants and Animals V. VI. VII. VIIL 



7. Food V. VI. VII. VIIL 



8. Mechanics V. VI. VII. VIIL 



9. Magnetism and Electricity V. VI. VII. VIIL 

 10. The Arts and Industries 



(applications of science) V. VI. VII. VIIL 

 There is not only a gradual transition from the 

 work of one grade to the work of the next higher grade, 

 aided by a brief summary of each topic, but there is 

 also an easy development of each topic from the pre- 

 ceding one. For example: (1) The sun produces (2) 

 Light, (3) Heat, affects the (4) Air, and the (5) Wa- 

 ter, causing (6) Plants and Animals to live, produces 



(7) Food, has gravitation, which is considered under 



(8) Mechanics, has an effect upon (9) Magnetism, 

 while aiding many of the (10) Industries. The ma- 

 terial has been carefully selected, while the develop- 

 ment proceeds from topic to topic and year to year. 



PERCY ELLIOTT ROWELL. 

 Berkeley, California. 

 March, 1913 



