THE ELEMENTS 



OF 



VEGETABLE HISTOLOGY 



BY 



C. W. BALLARD 



Associate Professor of Materia Medica and Director of the Microscopical 



Laboratory, College of Pharmacy, Columbia University. Microanalyst, 



Department of Health, City of New York 



/ aV^ u '^ '■', 



:|i /" ' ' ' r 



NEW YORK '%%/ " " ^ V 



JOHN WILEY & SONS, Inc!^'' 11 '^ 



London: CHAPMAN & HALL, Limited 

 1921 



