VII. — Researches into the Identity of the Exist- 

 encies or Forces — Lights Heat, Electricity, 

 and Magnetism. By John Goodman, Esq. 



(Read November 3, 1846,) 



On Thermo Electricity. 



It was discovered some years ago by Mr. Sturgeon, 

 that thermo Electricity does not require more than 

 one metal for its development. 



In confirming this discovery I have found that 

 the current was developed only by the more crys- 

 talline metals. Bismuth, Antimony, Iron, Steel, 

 Zinc, &c. as will appear on inspecting the accom- 

 panying Table. 



1 found also that each metal possessed its own 

 distinctive and peculiar amount of current, as 

 indicated by the galvanometer, and that, always 



