Experimental Researches in Electricity. S5S 



the entire identity of electricity, whencesoever derived, we 

 shall transcribe here : premising, that the effects obtained at 

 the original publication of the series under notice, are 

 marked by an oblique, those obtained subsequently by a 

 vertical cross. 



Table of the experimental effects common to the Electricities derived from 

 different sources. 





Physiologi- 

 cal effects. 



Magnetic de- 

 flection. 



1 Magnets 

 made. 



Spark. 



Heating pow- 

 er. 



True chemi- 

 cal action. 



Attraction & 

 repulsion. 



Discharge by 

 hot air. 





X 



X 



X 



X 



X 



X 



X 



X 





X 



X 



X 



X 



X 



X 



X 



X 





X 



X 



X 



X 



X 



X 



X 







X 



X 



+ 



+ 



+ 



+ 







5. Animal electricity, 



X 



X 



X 







X 







It thus appears that only five spaces remain unmarked, 

 two under attraction and repulsion, and three under dis- 

 charge by hot air; but although these effects have not yet 

 been obtained, it is a necessary conclusion that they must 

 be possible, since the spark corresponding to them has been 

 observed. For when a discharge across cold air can occur, 

 that intensity which is the only essential additional requi- 

 site for the other effects must be present. 



Having fully satisfied his own mind as to the identity of 

 electricities, Faraday next endeavoured to procure a com- 

 mon measure of the electricity excited by the machine and 

 that derived from the voltaic pile, not only for the purpose 

 of still farther confirming their identity, but also of demon- 

 strating certain general principles, and creating an extension 

 of the means of investigating and applying the chemical 

 power of this wonderful and subtile agent. 



2 z 



