TO 



JAMES DUNSMURE, ESQUIRE, 



MERCHANT IN LONDON. 



MY DEAR SIR, 



Without your aid, I should, in all 

 probability, never have acquired the knowledge, upon 

 which the following Essay is principally grounded ; since 

 I could not, I believe, have found any other place, con- 

 sidering that I was obliged to be daily in London, so well 

 fitted for my experiments, as that which you permitted 

 me to use during a very long time, though manifestly to 

 the great inconvenience of yourself and your family. I 

 beg leave to assure you, that I feel this kindness most 

 strongly, and that my gratitude for it will never cease to 

 exist. 



I am, 



My dear Sir, 



Your most obedient Servant, 



and faithful Friend, 

 WILLIAM CHARLES WELLS. 



Augu$tt5, 1814. 



