18 BULLETIN 871, IT. S. DEPARTMEXT OF AGRICULTURE. 
extended to 29.4 feet, and then the typical pockets of dry-rot reap- 
peared, which ultimately ended at a height of 41.4 feet. The only 
possible means of entrance for the two forms of decay were the small 
open fire scars at the ground level. A similar condition is presented 
in tree No. 7 on the intermediate area. This tree had a large open 
fire scar extending from the ground level to a height of 8 feet. Typical 
dry-rot entering through this open wound began at 6 feet, extending 
to 9.7 feet, where it merged into Trametes pini decay, which then gave 
place to the typical dry-rot at 14.7 feet, and the latter finally ended 
at a height of 20.7 feet. No line of demarcation could be distinguished 
between the two decays, and the point of entrance of the infection was 
at the open fire scar. Other examples could be cited, but these seem 
sufficient. 
In the eleven trees in which the dry-rot in small pockets occurred 
it was either very close to or intermingled with typical dry-rot in six, 
and in four of these six trees both forms of decay could be exactly 
traced to a common point of entrance. There were no apparent lines 
of demarcation in any instance between the two forms of decay. In 
tree No. 392 in the intermediate range typical pockets of dry-rot 
extended from ground level to 28.7 feet. At this point the typical 
decay changed to the small pockets, and this form occupied the 
heartwood to 36.9 feet, where the decay stopped altogether. 
Finally let us consider the eight trees in which both the dry-rot in 
small pockets and the Trametes pini decay were found. In two of 
the trees the two decays occurred in different parts of the bole. In 
two trees the decays were very close together, while in four trees the 
two were accompanied by pockets of typical dry-rot. Tree No. 296 
on the intermediate area offers an excellent illustration of this last 
condition. In this tree the dry-rot in small pockets, the Trametes pini 
decay, and typical pockets of dry-rot were intermingled, and transi- 
tion stages between the three forms were apparent from ground level 
to a height of 30,3 feet. In four of the eight infected trees it was 
possible to trace the entrance of both decays to the same point, 
healed fire scars. There were no lines of demarcation separating the 
various decays. 
The interesting point in connection with the two forms of dry-rot 
and the decay caused by Trametes pini is that they occurred in the 
same substrata, either merging into one another or actually inter- 
mingling without any well-defined lines between them. That such 
lines of demarcation between different decays are the general rule 
has long been accepted and has been most recently expressed again 
by Weir (31). Hence, it is particularly interesting to find two 
exactly opposite types of decay intermingling so freely. It is quite 
probable, however, that such occurrences in the future will come to 
be recognized as quite common, The writer has already found 
