DRY-ROT OF INCENSE CEDAR. 23 
dish purple, usually began at the ground level, extending up the heart- 
wood to a minimum height of 2.6 feet and a maximum height of 31.4 
feet. Of these trees 39 had open or healed-over wounds, mainly 
caused by fire, offering or having offered a means of access for the 
dry-rot, but the remaining 45 were without indications of wounds, 
the only possible mode of entrance for the decay being through 
branch stubs. It would be highly improbable that all of these trees 
could be infected by the dry-rot fungus without showing any indica- 
tions of decay, so the conclusion is obvious that purple coloration 
may exist unaccompanied by Poly poms amarus. 
In all, 510 trees with typical dry-rot alone or in conjunction with 
secondary decay were worked up at Sloat, Strawberry, and Crockers 
Station. Notes on 25 of these were incomplete so far as purple 
coloration is concerned, so they drop out of consideration. All but 
17 of the remaining 485 had purple coloration accompanying the 
decay. In certain cases the coloration did not extend over the entire 
decayed area, running out before the decay ended, or else isolated 
pockets of dry-rot were found outside the area of coloration. In the 
17 cases of dry-rot unaccompanied by any coloration, the decay as a 
rule was negligible. In four of these trees, however, there was a loss 
in volume caused by the dry-rot of 7.1, 21.3, 39, and 67 per cent, 
respectively, without any coloration being visible, indicating that 
serious decay can exist apart from the purple coloration. 
Of the 59 infections of the Trametes pini decay, 4 became impos- 
sible of consideration because of incomplete notes. Of the remaining 
55, 12 were unaccompanied by purple coloration, but^all of these 
except two were very superficial infections. Even in these two the 
amount of cull was very small. This decay had already been shown 
almost invariably to follow wounds in the trees; hence, it becomes 
quite reasonable to presume that the absence of purple coloration 
was brought about in most instances by the change in the physical or 
chemical condition of the heartwood induced by the influence of the 
wounds. 
Where the typical decay and the Trametes pini decay were inter- 
mingled the coloration was almost invariably present, although not 
always throughout the entire infected wood. This was also the case 
with the brown dotlike pockets. However, these data should not be 
judged as more valuable than indications, since the number of cases 
available was relatively few. 
Secondary rots comprised 43 infections; only 12 of these were in 
conjunction with purple coloration. The 31 without coloration only 
yielded one cull case; the amount of unmerchantable volume was 
very small, and furthermore these secondary rots were almost invari- 
ably in connection with healed or open wounds. 
