106 



LECTURE V. 



MAGNETISM ELECTKICITY. 



I WONDEK whether we shall be too deep to-day or 

 not. Kemember, that we spoke of the attraction 

 by gravitation of all bodies to all bodies by their 

 simple approach. Kemember, that we spoke 

 of the attraction of particles of the same kind 

 to each other, that power which keeps them 

 together in masses, iron attracted to iron, 

 brass to brass, or water to water. Remember, 

 that we found, on looking into water, that there 

 were particles of two different kinds attracted 

 to each other ; and this was a great step beyond 

 the first simple attraction of gravitation ; be- 

 cause here we deal with attraction between 

 different kinds of matter. The hydrogen could 

 attract the oxygen and reduce it to water, but 

 it could not attract any of its own particles, so 

 that there we obtained a first indication of the- 

 existence of two attractions. 



