594 
Journal of Agricultural Research 
Vol. XXX, No. 7 
The large majority of the infected 
internodes produced aecia in 1923 for 
the first time. As nearly as could be 
determined, not over 10 or 12 of them 
failed to produce aecia in April or 
May, 1923. Upon soipe of the branches 
there were so many infections that they 
coalesced before aecia were produced. 
On the other hand, some of the 10 or 
12 which did not produce aecia may 
Table I .—Distribution of 176 infec¬ 
tions found in 1922 on pines near 
Bold Point , B. C. 
Internode of 
Number 
of infec¬ 
tions 
1917___ _ 
5 
1918.____ 
36 
1919___ 
113 
1920____ 
22 
° By “internode of 1917” is meant that part of a 
stem or branch which began its growth in the grow¬ 
ing season of 1917. 
have been 1921 infections, which were 
beginning to appear in 1923. 
It would appear that all or nearly 
all of these infections occurred in the 
same year, since they developed prac¬ 
tically simultaneously and produced 
aecia first in 1923. It is very evident 
that no infections which began in the 
1920 internodes could have resulted 
from exposure earlier than 1920. If 
those in the internodes of 1917, 1918, 
or 1919 had occurred earlier than those 
in the 1920 internodes, they would 
have been older than the infections in 
the 1920 internodes and the greater 
part of them would have produced 
