A LITTLE PHYSICS 37 



in diameter. It is wheel within wheel from the 

 greatest to the least. The forces which run the 

 machinery of all the infinitely small worlds work 

 out results with as much regularity and precision 

 as do the forces which run the machinery of the 

 infinitely great worlds. 



The spaces between the heavenly bodies are 

 much larger than the spaces occupied by the bodies 

 themselves. So the spaces between the molecules 

 which compose the masses, between the atoms com- 

 posing the molecules, and between the electrons 

 composing the atoms, are severally much larger 

 than the spaces occupied by these bodies. 



The heavenly bodies are cemented together and 

 held in their places by gravitational attraction; 

 the molecules are cemented together and held in 

 their places in composing the heavenly bodies by 

 molecular attraction. The atoms are cemented to- 

 gether and held in their places to form the 

 molecules by electric and magnetic forces; and the 

 electrons are cemented together and held in their 

 places to compose the atoms by the same forces. 



All the heavenly bodies composing the universe 

 rotate on their axes, revolve around centers, and 

 have free motions in space. So the molecules with- 

 in, and forming all these, heavenly bodies rotate, 

 revolve around centers, and have free motions in 

 space; so the atoms within the molecules vibrate, 

 rotate, revolve, and have free motions; and so the 

 electrons jostle about, rotate, revolve, and have 

 free motions in space. Of course all the move- 



