The Law of Conservation. 25 



forth in undiminished exuberance, such mar- 

 vels of force, during all the ages, and remain 

 itself unexhausted ! 



The Great Law of Conservation of Force. 



But how speaks the law of conservation, 

 that law most enduring, and most inexora- 

 ble ? According to the decrees of that law, 

 whatever is received by the earth from the 

 sun, an equivalent for the same must again be 

 returned from the earth to the sun, to the 

 uttermost fraction. 2 Such being the condi- 

 tions, how may this retro-acting process that 

 all analogy and the profoundest scientific 

 axiom prove to be in constant operation- 

 how, I ask, may this retro-acting process be 

 explained ? What equivalent may the earth 

 give back as compensation for such enormous 

 benefits, for such stupendous powers ? The 

 laws of conservation may not be violated : 

 the earth will respond. 



How are the Spheres constructed? 



The constitution of these two retro-acting 

 spheres, and consequently of all the others of 



2 Appendix, p. 98. 



