TO 



WILLIAM MACLURE, , 



PRESIDENT OF THE ACADEMY OF NATURAL SCIENCES OF 



PHILADELPHIA, AND OF THE AMERICAN 



GEOLOGICAL SOCIETY, 



MEMBER OF THE AMERICAN PHILOSOPHICAL SOCIETY, 



&c. &c. 



Distinguished as a successful cultivator, and 

 munificent patron, of the Natural Sciences, this 

 Work is respectfully inscribed, 

 By his much obliged, 



and most obedient serv^ant, 



THE AUTHOR. 



