10 BULLETIN 799, U. S. DEPARTMENT OF AGRICULTURE. 
This indicates a greater number of the older trees of the 121 to 
160 age class on the Silver Creek sale area than on the Honeysuckle 
area. Continuing the inspection of the data in the table it is seen 
that the total volume of rot, the rot percentage, and the precentage 
of infected trees for the combined rots are all greater in the case of 
the Silver Creek area. The difference of 10 years between the average 
age for the two areas is apparently responsible for the difference in 
the rot activity just noted and gives further evidence that, the site 
being similar, the age of the stand affects the amount and percentage 
of rot as well as the number of trees infected. Eliminating the 
difference in the average ages between the two sale areas, the slope 
sites of the two areas should yield more nearly equal values for total 
volume of rot, rot percentage, and percentage 'of infected trees. 
Another interesting point brought out in Table II is the variation 
in the amount of butt-rot for the two areas. Very little butt-rot 
is found upon the Silver Creek area (1.6 cubic feet) in comparison 
to that found on the Honeysuckle area (96.1 cubic feet). 
In Table III comparisons are made between the rot percentages of 
trees occurring on the slope and bottom sites of the same sale areas. 
This method of comparison removes all possible variations which 
might be due to comparisons of plats occurring upon widely separated 
areas. In general, the figures show a higher rot percentage in trees 
occurring on the bottom sites than in those growing on the slopes. 
On the Bennett-Miner sale area plat 1 was laid out upon the slopes 
and plat 2 on the bottoms. The bottom sites have a greater average 
by 38 years and also a greater rot percentage by 6 than the slope sites. 
In comparing the slope and bottom sites of the Silver Creek plat 1 
area it is seen that the difference in average age is only 1 years, 
while the difference in rot percentage is approximately 5. Again, in 
comparing the Honeysuckle plat 1 with the Honeysuckle plat 1 area 
the difference in average age is 7 years and that of the rot percentage 
4.5. The greatest difference in rot percentage is found in comparing 
the Humbird area with the Tent Creek area, between which are found 
differences of 39 years in average age and 7 per cent in the rot. This 
last comparison is not as dependable as the ones preceding, since the 
slope and bottom areas compared were taken from two widely sepa- 
rated sale areas. Similar criticism also applies to the comparison 
of the Honeysuckle plat 3 with the Silver Creek plat 2 area, which 
comparison indicates the possibility that the difference in average 
age may not be entirely responsible for the small rot percentage in 
the Honeysuckle plat 3 area. Comparing the same Honeysuckle plat 
3 area with the Honej^suckle plat la area it is seen that a difference 
in rot percentage of 0.538 is more than balanced by a difference of 50 
years, which latter is no doubt accountable for the larger rot percent- 
age found on the slope sites. 
