CONTENTS 



CHAPTER PAGE 



1. GRAVITATION i 



1. A real place where things weigh nothing and 



where there is no up or down . ... i 



2. " Water seeks its own level" ... 6 



3. The sea of compressed air in which we live : 



Air pressure 10 



4. Sinking and floating : Displacement . . 23 



5. How things are kept from toppling over: 



Stability 29 



2. MOLECULAR ATTRACTION 36 



6. How liquids are absorbed: Capillary at- 



traction 36 



7. How things stick to one another : Adhesion 41 



8. The force that makes a thing hold together : 



20. Conduction of heat and convection . .116 



