Preface to the Sixth Edition 
Since the last edition of ‘Pharmaceutical Botany’? was 
published, knowledge in plant science has advanced rapidly 
and a new edition of the United States Pharmacopoeia and of 
the National Formulary have appeared. For these reasons 
another revision has been called for. 
In preparing this revision the writer has endeavored to keep 
in mind the requirements of varied courses in botany given to 
students of pharmacy in departments of botany of both the 
university schools and the independent pharmaceutical institu- 
tions. In both types of schools botany should be taught with 
cultural and professional objectives, and the pharmacy students 
provided with the proper pharmaceutical slant which need not 
detract from adequate treatment of the purely academic phases 
of the subject. 
A revision has, accordingly, been prepared which presents a 
broad general treatment of botany with particular stress upon 
those phases of this science such as histology, cell contents, tax- 
onomy, and medicinal plants which are believed to be most 
helpful in preparing students to cope with botanical problems 
in pharmacognosy and in the practice of pharmacy. 
In the course of this revision the writer has not only made 
changes in the text so as to bring the subject matter up to date 
but has reorganized some of the chapters, provided some better 
illustrations and added 121 new figures. 
The old chapter on Cytology has been deleted and in its 
place new chapters have been substituted on “The Living Cell” 
‘and on ‘“Non-protoplasmic Cell Contents.” Important ad- 
ditions have been made to the subject of the cell and its contents 
including an amplification of the subject matter on mitosis and 
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