Jt DEDICATION. 



•which I have ever enjoyed from the cultivation of Science : a hap- 

 piness which can only be conceived by those, who, like yourself, 

 have attached themselves to the amiable pursuits of Natural 

 Science. 



With the greatest respect, 



I remain, Dear Sir, 



Your very obedient and obliged Servant, 



BENJAMIN SMITH BARTON. 



Philadelphia, November 13fA, 1804. 



