

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. 



