46 NOTES TO BOOK XI. 



the investigation as the subject of the Eighteenth Series of 

 \\isResearcJies, sent to the Royal Society, Jan. 26, 1842 ; and 

 in this he illustrated, with his usual command of copious and 

 luminous experiments, a like view; that the electricity is 

 produced by the friction of the particles of the water car- 

 ried along by the steam. ^\.nd thus this is a new mani- 

 festation of that electricity, which, to distinguish it from 

 voltaic electricity, is sometimes called Friction Electricity 

 or Machine Electricity. Dr. Faraday has, however, in the 

 course of this investigation, brought to light several new 

 electrical relations of bodies. 



