THE KOTS OF WESTEEK WHITE PI^E. 21 
age, then it follows that the production of sporophores will also in- 
crease as the decay develops to that stage where fruiting bodies 
are produced. It is also to be expected that when the period of 
maximum sporophore production is passed there will be a gradual 
decline in the numbers produced and also in the numbers retained 
upon the trunk. Fewer new sporophores are produced in the old- 
aged trees of the stand, and of the old sporophores already on the 
tree many die, become loosened from the trunk, and drop off. The 
data show for l both types of site that there is an increase in the 
number of trees bearing sporophores and in the average number of 
sporophores per tree, from the 61 to 80 to the 121 to 160 age classes, 
inclusive, while a decrease is noted for the 161 to 200 and the 201 
age classes. This indicates a maximum sporophore production in 
the 121 to 160 age class and a declining production for the age 
classes following. 
Figures have been given which show that site plays an important 
part in the development of rot in a stand. The consensus of opinion 
among practical loggers is that low, flat, and poorly drained sites 
bear stands having the greatest amount of rot and that the sites 
where trees are freest from rot or where the rot percentage is small 
are well-drained slopes or benches. The comparison of slope and 
bottom sites in respect to rot percentage, both for age classes and 
for the total stand, indicates that a greater amount of rot is preva- 
lent on the bottom sites. A comparison between trees taken from 
similar sites upon widely separated areas and having a difference 
in average age of 10 years shows a difference of 1 per cent in rot be- 
tween these two areas. The percentage is greater on the area having 
the greater average age. The same indication is given by the figures 
for the percentage of infected trees. These data also furnish evi- 
dence of the influence of age upon the amount of rot to be found 
in a stand. Further comparisons of trees occurring on slope and 
bottom sites on the same sale areas also indicate that the trees on 
the bottom sites bear a greater percentage of rot than those on the 
slopes. 
In respect to the influence of site upon degree of injury the data 
do not show conclusively that a greater degree of injury exists upon 
bottom sites. The bottom sites with 2.4 and the slope sites with 1.9 
(Table V) leave too small a difference to attribute them to the in- 
fluence of site. Apparently greater percentages of infections are 
traced to branch stubs on the bottom sites than on the slopes. This 
may be due to the formation of a larger number of dead branches 
on the bottom sites as a result of greater shade. Light more easily 
reaches the lower branches of trees growing on a slope than of trees 
growing on the bottom sites, providing the densities are about equal. 
This might be a possible explanation of the formation of a greater 
