310 OHIO EXPERIMENT STATION: BULLETIN 214 
and wound fungi so especially dangerous with orchard, shade and 
forest trees. Somewhat fuller discussion of atmospheric agencies 
as affecting the occurrence and spread of plant diseases, of 
remedies for diseased conditions and of the application of the latter 
in combatting diseases and a presentation of storage troubles has 
also seemed desirable. Special attention is called tothe host plant 
in the matter of breeding or selection for disease resistance and in 
the contrasts offered by American and European points of view in 
plant disease study. 
ACKNOWLEDGMENTS 
The illustrations in this bulletin have been drawn from wider 
sources than in the previous hand book. A large number, including 
perhaps, a larger portion of the cuts, are taken from previous pub- 
lications of this Station by Weed, Miss Detmers, and the writer; 
small cuts have been at times made from certain larger illustrations 
while with others only portions of the original cut have been used. 
A great many of the illustrations are new, and I am deeply in- 
debted to Messrs. J. M. Van Hook and Thos. F. Manns for many of 
the photographs from which these have been made. I am also -in- 
debted to Professors Halsted of New Brunswick, N. J., and Atkin- 
son of Ithaca, N. Y., and to the Bureau of Plant Industry of the U.S. 
Department of Agriculture for many favors in the matter of cuts 
which are used in the Bulletin. Figures 24, 25, and 26 are from 
Dr. Freeman’s ‘‘Minnesota Plant Diseases.” For permission to 
reproduce these, Iam indebted to Prof. Frederick E. Clements, of 
‘the University of Minnesota. In all cases where it is not otherwise 
obvious, it has been the aim to state the source of the illustrations in 
the ‘descriptions. The same applies to illustrations reproduced 
from standard works. 
In many matters connected with recent investigations of the 
Department bearing upon diseases included in this present bulletin, 
and upon current examinations, I am under many obligations to 
Thos. F. Manns, Assistant Botanist, who has rendered very great 
assistance. 
