TO THE LATE 
WILLIAM MACLURE, Esq. 
President of the Academy of Natural Sciences in Philadelphia , $rc. $rc. 
AS A MEMENTO OF HIS ATTACHMENT TO, AND LIBERAL ENCOURAGEMENT 
OF, NATURAL SCIENCES IN NORTH AMERICA. 
ALSO TO 
F. ANDREW MICH AUX, 
Member of the American Philosophical Society , Correspondent of the Institute 
of France, ffc. tyc. 
WHOSE NAME IS IDENTIFIED WITH THE HISTORY AND IMPORTANCE OF 
THE PRODUCTIONS OF THE NORTH AMERICAN FOREST, 
THIS WORK IS MOST RESPECTFULLY DEDICATED 
BY 
THE AUTHOR OF THIS SUPPLEMENT. 
