IO4 New Theories of the Great Forces. 



FARADAY'S biographer says : " He is op- 

 pressed with the magnitude and importance 

 of his subject, yet is stimulated by the fact that 

 the discovery which he aims for (the relation- 

 ship between gravity and electricity) would 

 have a bearing in importance far beyond all 

 conception in elucidating not only the facts 

 connected with these subjects, but also others 

 of a high importance. There being scarcely 

 a limit to the subjects which would be illumi- 

 nated by it." 



11 Gravity, surely this force must be capable 

 of an experimental relation to electricity and 

 magnetism and the other forces, so as to bind 

 it up with them in reciprocal action and 

 equivalent effect."- FARADAY. 



KEPLER regarded gravity and heat " as 

 being probably derived from one single 

 principle." 



" There is every reason for believing that 

 the radiations which constitute heat and light 

 are essentially the same." 



" Gravity acts instantaneously." 



Static Electricity. 



12. (Page 52.) Speaking of static elec- 

 tricity, FARADAY remarks : " What an idea 



