Appendix. 103 



there are strong grounds for believing that 

 not only the molecular forces which unite "the 

 particles of material bodies depend ,m the 

 electric fluid, but that even gravitation itsfcjf , 

 which binds world to world, and sun to surv 

 can no longer be regarded as an ultimate 

 principle, but the residual portion of a far 

 more powerful force, generated by that ener- 

 getic agent which pervades creation." FARA- 

 DAY. 



" If gravitation is made to mean something 

 allied to magnetism, some poorly explained 

 phenomena become easily understood. But 

 what are the circumstances affording proof of 

 the identity of these forces ? First, gravita- 

 tion acts upon all kinds of matter; FARADAY 

 proved the same of magnetism. Second, 

 gravitation is attractive ; so is magnetism. 

 Third, gravitation is proportionate to the 

 mass ; the force of magnets also depends 

 upon the mass. Fourth, gravitation acts in 

 an inverse ratio to the square of the distance ; 

 so does magnetism. Fifth, gravitation does 

 not manifest polarity ; magnetism is known 

 not to do so. Sixth, gravitation acts inde- 

 pendently of bodies affording a resistance to 

 light and heat; so does magnetism." CART- 

 WELL. 



