39 



[ have made several thousands on electricity, magnetism, and electro- 

 magnetism, particularly the former, which have more or less bearing on 

 practical applications of this branch of science, brief minutes of which 

 fill several hundred folio pages. Many of these have not been published 

 in detail. They have cost me years of labor and much expense. 



The only reward I ever expected was the consciousness of advancing 

 science, the pleasure of discovering new truths, and the scientific reputa- 

 tion to which these labors would entitle me. 



JOSEPH HENRY. 



Sworn to before me, September 7, 1849. 



GEO. S. HILLARD, 



CommisBioner. 



