TO 
Sir JAMES EDWARD SMITH, M. D, 
FELLOW OF THE ROYAL SOCIETY^?-;, 
PRESIDENT OF THE LINN2EAN SOCIETY, 
ONE OS* THE MOST ACCOMPLISHED SCHOLARS, 
.AND THE FIRST BOTANIST OF THE AGE, 
THIS TREATISE 
IS MOST RESPECTFULLY INSCRIBEU 
BY 
THE AUTHOR, 
