Jan. i, 1925 Effect of Height of Chipping on Oleoresin Production 
93 
production during a part at least of the 
following year. 
Since extra numbers of resin pas¬ 
sages develop as a result of wounding, 
tests are now under w&y to determine 
whether the productivity of low faces 
can be increased further through stimu¬ 
lating advance resin tissue formation 
by means of slight wounds (such as 
inserting the gutter) a year or more in * 
advance of the first regular work. 
In the present tests it is significant 
that although 34-inch chipping gave a 
comparatively low yield early in the 
season it produced during midsummer 
and fall not Only as much as ^-inch 
chipping but even more—at the time 
when severely worked trees frequently 
show a tendency to dry-face and fail. 
The low faces, as compared with the 
high, showed a considerably increased 
value of products because of their 
higher yield. Converting the yield of 
the 20 test trees in each group t o a yield 
per crop basis, a rough but conserva¬ 
tive calculation indicates a difference 
of $200 in favor of the low faces. 
Cutting of low faces (with a streak 
less than 34 inch high) is under con¬ 
tinued test in 1924. On several other 
small experimental tracts carefully 
matched slash and longleaf pines of 
various ages and in varying environ¬ 
ments are being worked. It is clearly 
recognized that the present results 
obtained from one year’s work on a 
comparatively small number of test 
trees can only be regarded as indicative. 
The 34-inch chipping is now being tried 
on a commercial scale by practical 
operators who, for their own informa¬ 
tion, are comparing the yields from 
crops or portions of crops (drifts) as 
the case may be. It is expected that 
some significant results will be avail¬ 
able at the end of the 1924 season. 
