CONTENTS 



CHAPTER I 



PAGE 



THE EARTH .... ... . . . . 1 



The Earth and its Relation to the Universe. The 

 Planets. Satellites or Moons. Planetoids and Comets. 

 - Stars. Constellations. The North Star. The 

 Moon. Phases of the Moon. The Sun. Shape of the 

 Earth. Cause of the Shape of the Earth. Size of the 

 Earth. Consequences of the Shape and Size of the Earth. 

 Structure of the Earth. Motions of the Earth. 

 Rotation. Directions. The Celestial Meridian. 

 Meridians and Parallels. Latitude and Longitude. 

 Local Time. Standard Time. Revolution of the Earth. 

 Change of Seasons. 



CHAPTER II 



MATTER AND ITS PROPERTIES . . V .... 26 



Constitution of Matter. Properties of Matter. Meas- 

 urement. The Metric System. Metric Tables. The 

 Measurement of Length. The Measurement of Volume. 

 The Measurement of Mass. Density and Specific Gravity. 

 Densities of Liquids and Solids in Grams per Cubic Cen- 

 timeter. 



- CHAPTER III 



ENERGY AND FORCE . . . . -. . . . . . 37 



Gravity. Weight. Center of Gravity. Effect of 

 Air on Falling Bodies. Energy. Inertia and Force. 

 Centrifugal Force. Force of Expanding Gases. Molec- 

 ular Forces. Elasticity. Cohesion and Adhesion. 

 Shape of a Free Liquid. Capillarity. Diffusion. 

 Osmosis. 



ix 



