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. 



