Plate VI 
Fig. 1.— Cross section, cut April 24, 1916, from the peak, about 6 feet above the ground, of one of the trees 
shown in figure -1. The effects of 2 years of heavy chipping are manifested, even in this vigorous 
timber, by reduction in width of ring and in amount and density of summer wood in the 1914 and 1915 
rings. More resin passages than usual are present. The effect of the wound is apparent in the wood 
formed 6 feet above it in the 1914 ring. No wood formation for 1916 had occurred. Material from near 
Bogalusa, La. 
Fig. 2. — A boxed tree heavily chipped for five years. Wood structure shown in figure 3. Tree near Florida 
National Forest. 
Fig. 3.— Specimen cut from the peak of the tree shown in figure 2, about 8 feet above the ground. The 
response to turpentining is apparent in reduced wood formation in the five annual rings next the bark 
(top). The effects in the ring formed when turpentining was first begun were produced about 8 feet 
above the wound. The specimen was cut in May, 1916. No wood formation for that year was yet 
apparent. 
Fig. 4. — Timber of which the specimen shown in figure 1 is an example. 
Fig. 5. — Very heavy chipping was used on this small tree for 3 years. The wood formation was markedly 
reduced. The specimen was cut May 6, 1916. No wood formation for that year had occurred. 
Fig. 6.— Specimen from a conservatively chipped small tree. (Second year of turpentining by the French 
method.) This tree is from the same locality as the specimens shown'in figures 3 and 5. Here, however, 
5 or 6 rows of wood cells and one series of resin passages were already formed by May 6, 1916 (top next 
bark). In 1915, the first year of turpentining, summer wood formation was not reduced in this specimen. 
