inner leaves grew ont without showing any traces of the disease. In 
fact, nearly every stage was present between buds wdiich were quite 
dead before winter was over and buds which opened in a healthy and 
natural manner. The general impression gained from an examination 
of the trees when the first leaves were about half grown was that the buds 
must have been infected in some cases by spores which had lodged on 
them before they started to grow, and that in others the mycelium must 
have entered them from the branch. Those buds of which only the 
outer leaves were affected belong to the former class, and those which 
shriveled up because the axis that was still in a meristematic condition 
was attacked, belong to the latter. This is, however, merely a surmise, 
for it is quite possible that this case was simply caused by spores which 
had been washed by the rains further into the folds of the buds, and were 
consequently in a position where their germ tubes could penetrate the 
axis itself, and the mycelium produced from them enter the woody por¬ 
tions through the more delicate tissues of the bud. One thing, however, 
seems evident, this attack, which showed itself so early in the spring, can 
not be due to the same infection which now produces the characteristic 
spots of Gloeosjwrium nervisequum along the veins of some of the full- 
grown leaves. The disease is very scarce in Washington at present, 
but in other parts of the country the same state of affairs exists that 
existed here last spring. The leaves are for the great part diseased, 
some showing large brown patches, others withered from the effects of 
a diseased petiole or growing branch, and the ground is covered under 
the trees by leaves which have fallen from the effects of the fungus at 
the base of the petiole. 
The existence of large numbers of dead twigs on the trees at the time 
the blight is most active, and the appearance of other leaf fungi after 
the Glocosporium has ceased its attacks, raise the question at once 
whether some of these do not have some connection with the leaf blight. 
I have studied the question for some time, but all my experiments have 
produced merely negative results. 
The following paper by Franz von Tavel Contains descriptions of 
some of the most prevalent and important of these forms, together with 
detailed accounts of his experiments made with a view of determining 
their life history. It probably represents our best knowledge of the 
subject. The paper was published in German in the Botanische Zeitung 
for 188G; only a portion is printed in this number of the Journal, but 
the remainder will appear in succeeding numbers. 
