A TEXT-BOOK 



OF 



MYCOLOGY AND PLANT 

 PATHOLOGY 



BY 



JOHN W. HARSHBERGER, Ph.D. 



PROFESSOR OF BOTANY, UNIVERSITY' OF PENNSYLVANIA; MEMBER OF 



THE BOTANICAL SOCIETY OF AMERICA; VICE-PRESIDENT OF THE 



ECOLOGICAL SOCIETY OF AMERICA, ETC. 



WITH 271 ILLUSTRATIONS 



PHILADELPHIA 



P. BLAKISTON'S SON & CO. 



1012 WALNUT STREET 



