OLEORESIN PRODUCTION. 
13 
about 5.300 cups, operated by this method, was separately recorded, 
so that it could be compared with the yield obtained from the trees 
on similar stands of timber adjacent, which were operated by the 
two special methods under experiment. 
This operation was carried on for a period of two years. Figures 
1 and 2 give the monthly observations on the five trees selected in 
1916 and in 1917 (not the same five trees both years) . The number 
of tracheids counted in a radial direction across the ring indicates 
the diameter increase since the beginning of the year. The fluctua- 
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Fig. 1.— Standard trees, 1916. 
Number of tracheids, observed April to 
December ; in 1916, growth ring. "Sum- 
mer wood present. 
Number of resin centers per unit area 
(an arbitrary tangential extent ; diameter 
of microscopic field by the width of the 
annual ring observed). Observed April to 
December, 1916 ; in 1916, growing ring ; in 
1915, completed ring. 
tions in the number of resin passages present are also shown. In 
Tables 2 and 3 are given the relative increases and decreases in width 
of annual ring and percentage of summer wood as observed in 
December, 1916, in 50 trees chipped by each of the three methods 
under observation and in 20 unturpentined trees. In Table 4 are 
given similar observations for the years 1915, 1916, and 1917. 
In 1916 considerable variation was found in the number of trac- 
heids observed from month to month in the specimens from the five 
selected trees. (Fig. 1.) The width of the 1916 annual ring in 
the specimens cut near the end of the season was in several cases 
87404°— 22 3 
