32 



OPPOSITE FORCES OF CALORIC. 



towards their primaries, diminishes in the same 

 ratio. 



6. That by the joint operation of two forces, 

 each of which varies inversely as the squares of 

 the distance, the celestial bodies are impelled 

 through their orbits with velocities which vary 

 in accordance with Kepler's third law, as shown 

 in the following tables : 



TABLE I. 



TABLE II. 



SATELLITES OF JUPITER. 



TABLE III. 



SATELLITES OF SATURN. 



Periodic times. 



Mean dist. d. h. m. Velocities. 

 First Sat. 132,364 ... ... 22 ... 38 ... 36,750 



Seventh 2,542,180 ... 79 ... 7 ... 55 ... 8,389-5 



