THE BOTANICAL TEXT-BOOK. 



(SIXTH EDITION.) 



PART I. 



STRUCTURAL BOTANY 



. ORGAXOGRAM-IY ON THE BASIS OF 



MORPHOLOGY. 



TO WHICH IS ADDED THE PRINCIPLES OP 



TAXONOMY AND PHYTOGRAPHY, 



AND 



31 @I000arp of Botanical &erm0. 



BY 



ASA GRAY, LL.D., ETC., 

 // 



FISHER PROFESSOR OF NATURAL HISTORY (BOTANY) IN 

 HARVARD UNIVERSITY. 



LONDON: 

 MACMILLAN AND COMPANY. 



