VOLUME TABLES 51 
VOLUME TABLE OF STANDARDS 
The number of standards in each tree was deter- 
mined by Dimmick’s Rule, which is the common scale 
used in the Adirondacks. The trees were worked up 
together by grouping them in diameter classes differing 
by one inch, and in height classes differing by five feet. 
It was found that the average results were so regular 
for the trees of different diameters and heights that it 
was possible to make a table by merely eliminating 
the irregularities by means of curves. (Seep. 44.) At 
first the results of the trees cut for pulp at Santa Clara 
were kept separate from the results of the large trees 
cut in the Park, but the two series were found to cor- 
respond so exactly that they were thrown together into 
the single table of standards given below. The diame- 
ters in this table are taken breast-high, or four and one- 
half feet from the ground. Lumbermen usually refer 
to the diameter inside the bark on the stump, but that is 
an unsatisfactory measure, since the height of the stump 
varies greatly. In dealing with standing timber meas- 
urements must be taken outside the bark. A com- 
parison of the diameter inside the bark on the stump 
with the diameter breast-high showed that, in the trees 
analyzed, the former was on the average three-quarters 
of an inch (exactly 0.79) larger than the diameter 
breast-high. 
