TO 



RICHARD HALSTED WARD, M.D., 



Professor of Botany 



in the Rensselaer Polytechnic Institute, 



Troy, New York ; 



in the name of a long and true friendship; 



and in appreciative recognition 



of a Naturalist, 



distinguished alike for clearly apprehending, 



and skilfully imparting 



the treasures of a scientific scholarship, 



singularly wide and exact ; 



THIS BOOK 



IS AFFECTIONATELY INSCRIBED 

 BY 



THE AUTHOR. 



