CONTENTS 



PAGE 



PREFACE v 



To THE TEACHER ix 



CHAPTER I. THE RELATIONSHIPS OF GENERAL SCIENCE 



Scope Scientific methods Special sciences Growth of 

 science Practical value Practical exercises. 



CHAPTER II. THE UNIVERSE 



Extent The stars Light of the stars Constellations 

 Motion of the constellations The solar system The sun 

 The planets The moon Eclipses Shooting stars and 

 comets Time on the earth Practical exercises. 



CHAPTER III. STRUCTURE OF MATTER 13 



Matter and energy The molecular theory: The states of 

 matter Some properties of matter Physical and chemical 

 change Practical exercises. 



CHAPTER IV. ENERGY 18 



Movements of matter Heat and molecular motion Forms of 

 energy Kinetic and potential energy The source of energy 

 Heat and light compared Practical exercises. 



CHAPTER V. COMPOSITION OF MATTER 24 



Chemical elements Distribution of the chemical elements 

 Chemical symbols and formulas Chemical compounds 

 Proportions of elements in compounds Chemical affinity 

 Heat and chemical change Practical exercises. 



CHAPTER VI. THE MEASUREMENT OF MATTER 33 



Standards The advantage of the metric system The meter 

 Divisions of the metric system Grams and liters Practical 

 exercises. 



CHAPTER VII. DENSITY AND SPECIFIC GRAVITY 39 



Weight How density is measured Specific gravity Buoy- 

 ancy Practical exercises. 



CHAPTER VIII. MEASUREMENT OF TEMPERATURE 46 



How measured The thermometer Graduating the ther- 

 mometer Absolute zero Changing from Fahrenheit to Centi- 

 grade Other thermometers Practical exercises. 



